diff --git a/db/README.md b/db/README.md
index 70f534e..77729ed 100644
--- a/db/README.md
+++ b/db/README.md
@@ -18,6 +18,7 @@
 14. `db/migrations/0018_shopify_delta_sync_state.sql`
 15. `db/migrations/0019_allow_multiple_open_stock_lots.sql`
 16. `db/migrations/0020_include_stock_adjustments_in_balance.sql`
+17. `db/migrations/0021_stock_lot_activation_selection.sql`
 
 ## Beispielausfuehrung
 
diff --git a/db/migrations/0021_stock_lot_activation_selection.sql b/db/migrations/0021_stock_lot_activation_selection.sql
new file mode 100644
index 0000000..3ffac74
--- /dev/null
+++ b/db/migrations/0021_stock_lot_activation_selection.sql
@@ -0,0 +1,119 @@
+BEGIN;
+
+ALTER TABLE stock_lot
+  ADD COLUMN IF NOT EXISTS next_active BOOLEAN NOT NULL DEFAULT FALSE;
+
+CREATE UNIQUE INDEX IF NOT EXISTS uq_stock_lot_one_next_active_per_product
+  ON stock_lot(product_id)
+  WHERE status = 'open' AND next_active = TRUE;
+
+CREATE OR REPLACE FUNCTION fn_auto_switch_lot_when_depleted()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  v_product_id BIGINT;
+  v_open_lot_id BIGINT;
+  v_qualified_count INTEGER;
+  v_current_net NUMERIC;
+  v_event_key TEXT;
+BEGIN
+  SELECT product_id
+  INTO v_product_id
+  FROM stock_lot
+  WHERE id = NEW.lot_id;
+
+  IF NOT EXISTS (
+    SELECT 1 FROM stock_lot WHERE id = NEW.lot_id AND status = 'current'
+  ) THEN
+    RETURN NEW;
+  END IF;
+
+  SELECT qty_net
+  INTO v_current_net
+  FROM v_stock_lot_balance
+  WHERE stock_lot_id = NEW.lot_id;
+
+  IF COALESCE(v_current_net, 0) > 0 THEN
+    RETURN NEW;
+  END IF;
+
+  PERFORM 1
+  FROM stock_lot
+  WHERE product_id = v_product_id
+  FOR UPDATE;
+
+  IF NOT EXISTS (
+    SELECT 1 FROM stock_lot WHERE id = NEW.lot_id AND status = 'current'
+  ) THEN
+    RETURN NEW;
+  END IF;
+
+  SELECT sl.id
+  INTO v_open_lot_id
+  FROM stock_lot sl
+  INNER JOIN v_stock_lot_balance v ON v.stock_lot_id = sl.id
+  WHERE sl.product_id = v_product_id
+    AND sl.status = 'open'
+    AND sl.next_active = TRUE
+    AND NULLIF(TRIM(sl.lot_number), '') IS NOT NULL
+    AND sl.manufacturer_party_id IS NOT NULL
+    AND NULLIF(TRIM(sl.manufacturer_lot_number), '') IS NOT NULL
+    AND sl.mfg_date IS NOT NULL
+    AND sl.expiry_date IS NOT NULL
+    AND sl.purchase_date IS NOT NULL
+    AND v.qty_net > 0
+  LIMIT 1;
+
+  IF v_open_lot_id IS NULL THEN
+    SELECT COUNT(*), MIN(sl.id)
+    INTO v_qualified_count, v_open_lot_id
+    FROM stock_lot sl
+    INNER JOIN v_stock_lot_balance v ON v.stock_lot_id = sl.id
+    WHERE sl.product_id = v_product_id
+      AND sl.status = 'open'
+      AND NULLIF(TRIM(sl.lot_number), '') IS NOT NULL
+      AND sl.manufacturer_party_id IS NOT NULL
+      AND NULLIF(TRIM(sl.manufacturer_lot_number), '') IS NOT NULL
+      AND sl.mfg_date IS NOT NULL
+      AND sl.expiry_date IS NOT NULL
+      AND sl.purchase_date IS NOT NULL
+      AND v.qty_net > 0;
+
+    IF v_qualified_count <> 1 THEN
+      RETURN NEW;
+    END IF;
+
+    UPDATE stock_lot
+    SET next_active = TRUE, updated_at = NOW()
+    WHERE id = v_open_lot_id;
+  END IF;
+
+  UPDATE stock_lot
+  SET status = 'closed', updated_at = NOW()
+  WHERE id = NEW.lot_id;
+
+  UPDATE stock_lot
+  SET status = 'current', next_active = FALSE, updated_at = NOW()
+  WHERE id = v_open_lot_id;
+
+  v_event_key := format('lot.auto_switched:%s:%s', v_product_id, txid_current());
+
+  PERFORM fn_enqueue_event(
+    'lot.auto_switched',
+    v_event_key,
+    'stock_lot',
+    NEW.lot_id::TEXT,
+    jsonb_build_object(
+      'productId', v_product_id,
+      'closedLotId', NEW.lot_id,
+      'newCurrentLotId', v_open_lot_id,
+      'occurredAt', NOW()
+    )
+  );
+
+  RETURN NEW;
+END;
+$$;
+
+COMMIT;
diff --git a/modules/erp/lager/api/lot.php b/modules/erp/lager/api/lot.php
index f699b6f..710d21b 100644
--- a/modules/erp/lager/api/lot.php
+++ b/modules/erp/lager/api/lot.php
@@ -74,6 +74,7 @@ try {
             (int) ($data['lotId'] ?? 0),
             (string) ($currentUser['username'] ?? $currentUser['email'] ?? 'unknown')
         );
+        sync_open_lot_activation_selection($pdo, $productId);
         json_response(200, ['ok' => true, 'productId' => $productId, 'availableQty' => get_lager_product_available_qty($pdo, $productId)]);
     }
 
@@ -81,8 +82,22 @@ try {
         $productId = (int) ($data['productId'] ?? 0);
         $lotNumber = trim((string) ($data['lotNumber'] ?? ''));
         $lotId = (int) ($data['lotId'] ?? 0);
-        if ($lotNumber === '' && $lotId <= 0) {
-            throw new InvalidArgumentException('Naurua-Chargennummer fehlt');
+        $manufacturerPartyId = $data['manufacturerPartyId'] ?? null;
+        $manufacturerPartyId = $manufacturerPartyId === null || $manufacturerPartyId === '' ? null : (int) $manufacturerPartyId;
+        $manufacturerLotNumber = trim((string) ($data['manufacturerLotNumber'] ?? ''));
+        $mfgDate = trim((string) ($data['mfgDate'] ?? ''));
+        $expiryDate = trim((string) ($data['expiryDate'] ?? ''));
+        $purchaseDate = trim((string) ($data['purchaseDate'] ?? ''));
+        $receiptQty = isset($data['receiptQty']) && $data['receiptQty'] !== '' ? (float) $data['receiptQty'] : 0.0;
+        $targetQty = isset($data['targetQty']) && $data['targetQty'] !== '' ? (float) $data['targetQty'] : null;
+        if ($lotNumber === '' || $manufacturerPartyId === null || $manufacturerLotNumber === '' || $mfgDate === '' || $expiryDate === '' || $purchaseDate === '') {
+            throw new InvalidArgumentException('Alle Chargenfelder sind Pflichtfelder');
+        }
+        if ($lotId <= 0 && $receiptQty <= 0) {
+            throw new InvalidArgumentException('Eingangsmenge muss groesser als 0 sein');
+        }
+        if ($lotId > 0 && $targetQty !== null && $targetQty <= 0) {
+            throw new InvalidArgumentException('Menge muss groesser als 0 sein');
         }
         if ($lotId > 0) {
             $lotStmt = $pdo->prepare(
@@ -97,20 +112,16 @@ try {
                 throw new InvalidArgumentException('Offene Charge nicht gefunden');
             }
         } else {
-            $lotId = get_or_create_open_lot($pdo, $productId);
+            $lotId = create_open_lot($pdo, $productId);
         }
-        $manufacturerPartyId = $data['manufacturerPartyId'] ?? null;
-        $manufacturerPartyId = $manufacturerPartyId === null || $manufacturerPartyId === '' ? null : (int) $manufacturerPartyId;
-        $receiptQty = isset($data['receiptQty']) && $data['receiptQty'] !== '' ? (float) $data['receiptQty'] : 0.0;
-        $targetQty = isset($data['targetQty']) && $data['targetQty'] !== '' ? (float) $data['targetQty'] : null;
         $preparedLot = update_stock_lot_traceability(
             $pdo,
             $lotId,
             $manufacturerPartyId,
-            isset($data['manufacturerLotNumber']) ? (string) $data['manufacturerLotNumber'] : null,
-            isset($data['mfgDate']) ? (string) $data['mfgDate'] : null,
-            isset($data['expiryDate']) ? (string) $data['expiryDate'] : null,
-            isset($data['purchaseDate']) ? (string) $data['purchaseDate'] : null,
+            $manufacturerLotNumber,
+            $mfgDate,
+            $expiryDate,
+            $purchaseDate,
             (string) ($currentUser['username'] ?? $currentUser['email'] ?? 'unknown'),
             $receiptQty,
             0.0,
@@ -119,11 +130,19 @@ try {
             $targetQty,
             $lotId > 0 && $lotNumber === ''
         );
+        sync_open_lot_activation_selection($pdo, $productId);
         refresh_lager_stock_lot_forecast_for_product($pdo, $productId);
         $forecast = get_lager_product_forecast($pdo, $productId);
         json_response(200, ['ok' => true, 'productId' => $productId, 'lot' => $preparedLot, 'balance' => get_stock_lot_balance($pdo, $lotId), 'availableQty' => get_lager_product_available_qty($pdo, $productId), 'forecast' => $forecast]);
     }
 
+    if ($action === 'select_open_lot') {
+        $productId = (int) ($data['productId'] ?? 0);
+        $lotId = (int) ($data['lotId'] ?? 0);
+        select_open_lot_for_activation($pdo, $productId, $lotId);
+        json_response(200, ['ok' => true, 'productId' => $productId, 'selectedLotId' => $lotId]);
+    }
+
     json_response(422, ['ok' => false, 'error' => 'Unsupported action']);
 } catch (JsonException) {
     json_response(400, ['ok' => false, 'error' => 'Invalid JSON payload']);
diff --git a/modules/erp/lager/service.php b/modules/erp/lager/service.php
index 17789a2..ebbdd36 100644
--- a/modules/erp/lager/service.php
+++ b/modules/erp/lager/service.php
@@ -205,6 +205,7 @@ function get_lager_product_overview(PDO $pdo): array
             sl.mfg_date,
             sl.expiry_date,
             sl.purchase_date,
+            sl.next_active,
             COALESCE(v.qty_in, 0) AS qty_in,
             COALESCE(v.qty_net, 0) AS qty_net
          FROM stock_lot sl
@@ -223,9 +224,10 @@ function get_lager_product_overview(PDO $pdo): array
                 'manufacturer_name' => $openLot['manufacturer_name'],
                 'mfg_date' => $openLot['mfg_date'],
                 'expiry_date' => $openLot['expiry_date'],
-                'purchase_date' => $openLot['purchase_date'],
-                'qty_in' => (float) $openLot['qty_net'],
-                'qty_net' => (float) $openLot['qty_net'],
+            'purchase_date' => $openLot['purchase_date'],
+            'qty_in' => (float) $openLot['qty_net'],
+            'qty_net' => (float) $openLot['qty_net'],
+            'next_active' => (bool) $openLot['next_active'],
         ];
     }
 
@@ -466,6 +468,145 @@ function update_stock_lot_traceability(
     }
 }
 
+function is_qualified_open_lot(PDO $pdo, int $lotId): bool
+{
+    $stmt = $pdo->prepare(
+        "SELECT EXISTS (
+            SELECT 1
+            FROM stock_lot sl
+            INNER JOIN v_stock_lot_balance v ON v.stock_lot_id = sl.id
+            WHERE sl.id = :lot_id
+              AND sl.status = 'open'
+              AND NULLIF(TRIM(sl.lot_number), '') IS NOT NULL
+              AND sl.manufacturer_party_id IS NOT NULL
+              AND NULLIF(TRIM(sl.manufacturer_lot_number), '') IS NOT NULL
+              AND sl.mfg_date IS NOT NULL
+              AND sl.expiry_date IS NOT NULL
+              AND sl.purchase_date IS NOT NULL
+              AND v.qty_net > 0
+        )"
+    );
+    $stmt->execute([':lot_id' => $lotId]);
+    return (bool) $stmt->fetchColumn();
+}
+
+function sync_open_lot_activation_selection(PDO $pdo, int $productId): void
+{
+    $qualifiedStmt = $pdo->prepare(
+        "SELECT sl.id
+         FROM stock_lot sl
+         INNER JOIN v_stock_lot_balance v ON v.stock_lot_id = sl.id
+         WHERE sl.product_id = :product_id
+           AND sl.status = 'open'
+           AND NULLIF(TRIM(sl.lot_number), '') IS NOT NULL
+           AND sl.manufacturer_party_id IS NOT NULL
+           AND NULLIF(TRIM(sl.manufacturer_lot_number), '') IS NOT NULL
+           AND sl.mfg_date IS NOT NULL
+           AND sl.expiry_date IS NOT NULL
+           AND sl.purchase_date IS NOT NULL
+           AND v.qty_net > 0
+         ORDER BY sl.id
+         FOR UPDATE"
+    );
+    $qualifiedStmt->execute([':product_id' => $productId]);
+    $qualifiedIds = array_map('intval', $qualifiedStmt->fetchAll(PDO::FETCH_COLUMN));
+
+    if (count($qualifiedIds) === 1) {
+        $selectedId = $qualifiedIds[0];
+        $clearStmt = $pdo->prepare(
+            "UPDATE stock_lot
+             SET next_active = FALSE, updated_at = NOW()
+             WHERE product_id = :product_id AND status = 'open'"
+        );
+        $clearStmt->execute([':product_id' => $productId]);
+        $selectStmt = $pdo->prepare(
+            "UPDATE stock_lot
+             SET next_active = TRUE, updated_at = NOW()
+             WHERE id = :lot_id"
+        );
+        $selectStmt->execute([':lot_id' => $selectedId]);
+        return;
+    }
+
+    if ($qualifiedIds === []) {
+        $clearStmt = $pdo->prepare(
+            "UPDATE stock_lot
+             SET next_active = FALSE, updated_at = NOW()
+             WHERE product_id = :product_id AND status = 'open'"
+        );
+        $clearStmt->execute([':product_id' => $productId]);
+        return;
+    }
+
+    $selectedStmt = $pdo->prepare(
+        "SELECT id
+         FROM stock_lot
+         WHERE product_id = :product_id
+           AND status = 'open'
+           AND next_active = TRUE
+         LIMIT 1
+         FOR UPDATE"
+    );
+    $selectedStmt->execute([':product_id' => $productId]);
+    $selectedId = $selectedStmt->fetchColumn();
+    if ($selectedId !== false && in_array((int) $selectedId, $qualifiedIds, true)) {
+        return;
+    }
+
+    $clearStmt = $pdo->prepare(
+        "UPDATE stock_lot
+         SET next_active = FALSE, updated_at = NOW()
+         WHERE product_id = :product_id AND status = 'open'"
+    );
+    $clearStmt->execute([':product_id' => $productId]);
+}
+
+function select_open_lot_for_activation(PDO $pdo, int $productId, int $lotId): void
+{
+    if ($productId <= 0 || $lotId <= 0 || !is_qualified_open_lot($pdo, $lotId)) {
+        throw new InvalidArgumentException('Nur eine qualifizierte offene Charge kann ausgewaehlt werden');
+    }
+
+    $lotStmt = $pdo->prepare(
+        "SELECT product_id, status
+         FROM stock_lot
+         WHERE id = :lot_id
+         FOR UPDATE"
+    );
+    $lotStmt->execute([':lot_id' => $lotId]);
+    $lot = $lotStmt->fetch();
+    if (!is_array($lot) || (int) $lot['product_id'] !== $productId || (string) $lot['status'] !== 'open') {
+        throw new InvalidArgumentException('Offene Charge nicht gefunden');
+    }
+
+    $startedTransaction = !$pdo->inTransaction();
+    if ($startedTransaction) {
+        $pdo->beginTransaction();
+    }
+    try {
+        $clearStmt = $pdo->prepare(
+            "UPDATE stock_lot
+             SET next_active = FALSE, updated_at = NOW()
+             WHERE product_id = :product_id AND status = 'open'"
+        );
+        $clearStmt->execute([':product_id' => $productId]);
+        $selectStmt = $pdo->prepare(
+            "UPDATE stock_lot
+             SET next_active = TRUE, updated_at = NOW()
+             WHERE id = :lot_id"
+        );
+        $selectStmt->execute([':lot_id' => $lotId]);
+        if ($startedTransaction) {
+            $pdo->commit();
+        }
+    } catch (Throwable $error) {
+        if ($startedTransaction && $pdo->inTransaction()) {
+            $pdo->rollBack();
+        }
+        throw $error;
+    }
+}
+
 function get_current_lot_balance_for_update(PDO $pdo, int $productId): array
 {
     $stmt = $pdo->prepare(
@@ -820,23 +961,8 @@ function get_or_create_virtual_shortage_lot(PDO $pdo, int $productId): int
     return (int) $newLotId;
 }
 
-function get_or_create_open_lot(PDO $pdo, int $productId): int
+function create_open_lot(PDO $pdo, int $productId): int
 {
-    $select = $pdo->prepare(
-        "SELECT id
-         FROM stock_lot
-         WHERE product_id = :product_id
-           AND status = 'open'
-         ORDER BY id
-         LIMIT 1
-         FOR UPDATE"
-    );
-    $select->execute([':product_id' => $productId]);
-    $lotId = $select->fetchColumn();
-    if ($lotId !== false) {
-        return (int) $lotId;
-    }
-
     $insert = $pdo->prepare(
         "INSERT INTO stock_lot (product_id, status, created_at, updated_at)
          VALUES (:product_id, 'open', NOW(), NOW())
diff --git a/modules/shared/auth/ui/home.php b/modules/shared/auth/ui/home.php
index cbfdeef..352593f 100644
--- a/modules/shared/auth/ui/home.php
+++ b/modules/shared/auth/ui/home.php
@@ -334,9 +334,19 @@ function auth_render_lager_open_lots(array $lagerProducts, string $manufacturerO
         $html[] = '<div data-lager-open-product="' . $productId . '" hidden>';
         foreach (($product['open_lots'] ?? []) as $lot) {
             $lotId = (int) ($lot['lot_id'] ?? 0);
-            $html[] = '<div class="sg-delete-confirmation-pattern__stage sg-delete-confirmation-pattern__host" data-pattern="overlay-card" data-dialog-open="false" data-lager-open-card-wrapper="' . $lotId . '"><article class="sg-card sg-card--content-card sg-delete-confirmation-pattern__target" data-component="content-card" data-pattern="overlay-card" aria-label="Offene Charge">'
-                . '<div class="sg-card-segment sg-card-segment--header sg-card-segment--darkgreen sg-object-card__header" data-component-part="card-header"><div class="sg-strong sg-text-on-dark">Offene Charge</div><div class="sg-component-row"><button class="sg-interaction-element sg-button sg-button--warning" type="button" data-component="button" data-component-variant="warning" data-lager-open-delete>Löschen</button><button class="sg-interaction-element sg-button sg-button--active" type="button" data-lager-open-edit-open>Bearbeiten</button></div></div>'
-                . '<div class="sg-card-segment sg-card-segment--body" data-component-part="card-body" data-lager-open-card="' . (int) ($lot['lot_id'] ?? 0) . '"><p class="sg-body"><strong>Naurua-Chargennummer:</strong> <span data-lager-open-card-lot-number>' . auth_escape_html((string) ($lot['lot_number'] ?? 'Nicht hinterlegt')) . '</span><br>'
+            $selectedClass = !empty($lot['next_active']) ? ' sg-lager-open-lot--next-active' : '';
+            $selectedText = !empty($lot['next_active']) ? 'Als nächste aktive Charge ausgewählt' : 'Nicht ausgewählt';
+            $isQualified = trim((string) ($lot['lot_number'] ?? '')) !== ''
+                && (int) ($lot['manufacturer_party_id'] ?? 0) > 0
+                && trim((string) ($lot['manufacturer_lot_number'] ?? '')) !== ''
+                && trim((string) ($lot['mfg_date'] ?? '')) !== ''
+                && trim((string) ($lot['expiry_date'] ?? '')) !== ''
+                && trim((string) ($lot['purchase_date'] ?? '')) !== ''
+                && (float) ($lot['qty_net'] ?? 0) > 0;
+            $selectButton = '<button class="sg-interaction-element sg-button sg-button--active" type="button" data-lager-open-select' . ($isQualified ? '' : ' disabled aria-disabled="true"') . '>Als nächste aktive auswählen</button>';
+            $html[] = '<div class="sg-delete-confirmation-pattern__stage sg-delete-confirmation-pattern__host' . $selectedClass . '" data-pattern="overlay-card" data-dialog-open="false" data-lager-open-card-wrapper="' . $lotId . '"><article class="sg-card sg-card--content-card sg-delete-confirmation-pattern__target" data-component="content-card" data-pattern="overlay-card" aria-label="Offene Charge">'
+                . '<div class="sg-card-segment sg-card-segment--header sg-card-segment--darkgreen sg-object-card__header" data-component-part="card-header"><div class="sg-strong sg-text-on-dark">Offene Charge</div><div class="sg-component-row">' . $selectButton . '<button class="sg-interaction-element sg-button sg-button--warning" type="button" data-component="button" data-component-variant="warning" data-lager-open-delete>Löschen</button><button class="sg-interaction-element sg-button sg-button--active" type="button" data-lager-open-edit-open>Bearbeiten</button></div></div>'
+                . '<div class="sg-card-segment sg-card-segment--body" data-component-part="card-body" data-lager-open-card="' . (int) ($lot['lot_id'] ?? 0) . '"><p class="sg-body"><strong>Auswahl:</strong> <span data-lager-open-card-next-active>' . auth_escape_html($selectedText) . '</span><br><strong>Naurua-Chargennummer:</strong> <span data-lager-open-card-lot-number>' . auth_escape_html((string) ($lot['lot_number'] ?? 'Nicht hinterlegt')) . '</span><br>'
                 . '<strong>Status:</strong> Vorbereitet<br>'
                 . '<strong>Bestand:</strong> <span data-lager-open-card-qty-net>' . auth_format_lager_quantity((float) ($lot['qty_net'] ?? 0)) . '</span><br>'
                 . '<strong>Eingangsmenge:</strong> <span data-lager-open-card-qty-in>' . auth_format_lager_quantity((float) ($lot['qty_in'] ?? 0)) . '</span><br>'
@@ -347,13 +357,13 @@ function auth_render_lager_open_lots(array $lagerProducts, string $manufacturerO
                 . '<strong>Einkaufsdatum:</strong> <span data-lager-open-card-purchase-date>' . auth_format_lager_date($lot['purchase_date'] ?? null) . '</span></p></div>'
                 . '<div class="sg-card-segment sg-card-segment--body sg-card-segment--gray" data-lager-open-edit-form hidden><div class="sg-form-sections-card-wrapper" data-pattern="form-sections" aria-label="Offene Charge bearbeiten"><form class="sg-form-sections-card" data-lager-open-edit-form-element><div class="sg-form-sections-card__body" data-pattern-part="form-body"><h2 class="sg-strong sg-form-sections-card__title">Offene Charge bearbeiten</h2>'
                 . '<section class="sg-form-sections-card__chapter" aria-labelledby="lager-open-charge-data-' . $lotId . '"><h2 id="lager-open-charge-data-' . $lotId . '" class="sg-strong sg-form-sections-card__chapter-title">Chargendaten</h2>'
-                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Naurua-Chargennummer</span><input class="sg-interaction-element sg-input-single-line" type="text" data-lager-open-lot-number value="' . auth_escape_html((string) ($lot['lot_number'] ?? '')) . '"></label></div>'
-                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Hersteller</span><select class="sg-interaction-element sg-input-single-line" data-lager-open-manufacturer>' . str_replace('value="' . (int) ($lot['manufacturer_party_id'] ?? 0) . '"', 'value="' . (int) ($lot['manufacturer_party_id'] ?? 0) . '" selected', $manufacturerOptions) . '</select></label></div>'
-                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Hersteller-Chargennummer</span><input class="sg-interaction-element sg-input-single-line" type="text" data-lager-open-manufacturer-lot value="' . auth_escape_html((string) ($lot['manufacturer_lot_number'] ?? '')) . '"></label></div>'
-                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Herstellungsdatum</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-open-mfg-date value="' . auth_escape_html((string) ($lot['mfg_date'] ?? '')) . '"></label></div>'
-                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">MHD</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-open-expiry-date value="' . auth_escape_html((string) ($lot['expiry_date'] ?? '')) . '"></label></div>'
-                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Einkaufsdatum</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-open-purchase-date value="' . auth_escape_html((string) ($lot['purchase_date'] ?? '')) . '"></label></div>'
-                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Menge</span><input class="sg-interaction-element sg-input-single-line" type="number" min="0" step="1" inputmode="numeric" data-lager-open-target-qty value="' . auth_escape_html((string) ($lot['qty_net'] ?? 0)) . '"></label></div>'
+                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Naurua-Chargennummer</span><input class="sg-interaction-element sg-input-single-line" type="text" data-lager-open-lot-number value="' . auth_escape_html((string) ($lot['lot_number'] ?? '')) . '" required></label></div>'
+                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Hersteller</span><select class="sg-interaction-element sg-input-single-line" data-lager-open-manufacturer required>' . str_replace('value="' . (int) ($lot['manufacturer_party_id'] ?? 0) . '"', 'value="' . (int) ($lot['manufacturer_party_id'] ?? 0) . '" selected', $manufacturerOptions) . '</select></label></div>'
+                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Hersteller-Chargennummer</span><input class="sg-interaction-element sg-input-single-line" type="text" data-lager-open-manufacturer-lot value="' . auth_escape_html((string) ($lot['manufacturer_lot_number'] ?? '')) . '" required></label></div>'
+                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Herstellungsdatum</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-open-mfg-date value="' . auth_escape_html((string) ($lot['mfg_date'] ?? '')) . '" required></label></div>'
+                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">MHD</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-open-expiry-date value="' . auth_escape_html((string) ($lot['expiry_date'] ?? '')) . '" required></label></div>'
+                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Einkaufsdatum</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-open-purchase-date value="' . auth_escape_html((string) ($lot['purchase_date'] ?? '')) . '" required></label></div>'
+                . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Menge</span><input class="sg-interaction-element sg-input-single-line" type="number" min="1" step="1" inputmode="numeric" data-lager-open-target-qty value="' . auth_escape_html((string) ($lot['qty_net'] ?? 0)) . '" required></label></div>'
                 . '</section><footer class="sg-form-sections-card__actions-segment" data-pattern-part="form-actions-segment"><div class="sg-form-sections-card__actions" data-pattern-part="form-actions"><button class="sg-interaction-element sg-button sg-button--active sg-form-sections-card__action" type="button" data-lager-open-edit-close>Abbrechen</button><button class="sg-interaction-element sg-button sg-button--process sg-form-sections-card__action" type="submit">Speichern</button></div></footer><p class="sg-body" data-lager-open-edit-status aria-live="polite"></p></div></form></div></div></article>'
                 . '<article class="sg-card sg-card--overlay-host sg-delete-confirmation-pattern__floating-card" aria-label="Leere Felder bestätigen" role="dialog" aria-modal="true" aria-labelledby="lager-open-confirmation-title-' . $lotId . '" data-lager-open-confirmation-card hidden><div class="sg-card-segment sg-card-segment--body sg-delete-confirmation-pattern__body"><p class="sg-body sg-delete-confirmation-pattern__text" id="lager-open-confirmation-title-' . $lotId . '"><strong>Leere Felder speichern?</strong></p><p class="sg-body sg-delete-confirmation-pattern__text">Die folgenden Felder werden leer gespeichert:</p><div class="sg-delete-confirmation-pattern__list" data-lager-open-confirmation-empty-fields aria-label="Leer zu speichernde Felder"></div><div class="sg-delete-confirmation-pattern__actions"><button class="sg-interaction-element sg-button sg-button--active" type="button" data-lager-open-confirmation-cancel>Abbrechen</button><button class="sg-interaction-element sg-button sg-button--process" type="button" data-lager-open-confirmation-submit>Speichern</button></div></div></article>'
                 . '<article class="sg-card sg-card--overlay-host sg-delete-confirmation-pattern__floating-card" aria-label="Löschbestätigung" role="dialog" aria-modal="true" aria-labelledby="lager-open-delete-title-' . $lotId . '" data-overlay-dialog="delete" data-lager-open-delete-confirmation hidden><div class="sg-card-segment sg-card-segment--body sg-delete-confirmation-pattern__body"><p class="sg-body sg-delete-confirmation-pattern__text" id="lager-open-delete-title-' . $lotId . '"><strong>Möchtest du diese offene Charge wirklich löschen?</strong></p><p class="sg-body sg-delete-confirmation-pattern__text">Du kannst das nicht rückgängig machen. Bestätige durch Eingabe von <span class="sg-delete-confirmation-pattern__code">DELETE</span>.</p><label class="sg-labeled-input-row sg-delete-confirmation-pattern__input-row"><span class="sg-label">Bestätigung</span><input class="sg-interaction-element sg-input-single-line sg-input-single-line--inactive-selectable sg-form-inactive-selectable" type="text" placeholder="DELETE" aria-label="Löschbestätigung durch DELETE" data-lager-open-delete-confirmation-input></label><p class="sg-body" data-lager-open-delete-status aria-live="polite"></p><div class="sg-delete-confirmation-pattern__actions"><button class="sg-interaction-element sg-button sg-button--active" type="button" data-lager-open-delete-confirmation-cancel>Abbrechen</button><button class="sg-interaction-element sg-button sg-button--process sg-button--process-inactive" type="button" disabled aria-disabled="true" data-lager-open-delete-confirmation-submit>Löschen</button></div></div></article></div>';
@@ -397,12 +407,12 @@ function auth_render_lager_content(array $lagerProducts, array $lagerArtikel, ar
         . '<div class="sg-notifications-pattern" data-lager-new-lot-notification-wrapper hidden><article class="sg-card sg-notifications-pattern__card" data-pattern="notification-small" data-component="notification-card"><div class="sg-card-segment sg-card-segment--header sg-card-segment--signal-green sg-notifications-pattern__text-segment sg-notifications-pattern__text-segment--small" data-component-part="card-header"><p class="sg-body" data-lager-new-lot-notification></p></div></article></div>'
         . '<section class="sg-form-sections-card__chapter" aria-labelledby="lager-new-charge-data-title"><h2 id="lager-new-charge-data-title" class="sg-strong sg-form-sections-card__chapter-title">Chargendaten</h2>'
         . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Naurua-Chargennummer</span><input class="sg-interaction-element sg-input-single-line" type="text" data-lager-new-lot-number required></label></div>'
-        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Hersteller</span><select class="sg-interaction-element sg-input-single-line" data-lager-new-manufacturer>' . $manufacturerOptions . '</select></label></div>'
-        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Hersteller-Chargennummer</span><input class="sg-interaction-element sg-input-single-line" type="text" data-lager-new-manufacturer-lot></label></div>'
-        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Herstellungsdatum</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-new-mfg-date></label></div>'
-        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">MHD</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-new-expiry-date></label></div>'
-        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Einkaufsdatum</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-new-purchase-date></label></div>'
-        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Eingangsmenge</span><input class="sg-interaction-element sg-input-single-line" type="number" min="0" step="1" inputmode="numeric" data-lager-new-receipt-qty placeholder="Menge"></label></div>'
+        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Hersteller</span><select class="sg-interaction-element sg-input-single-line" data-lager-new-manufacturer required>' . $manufacturerOptions . '</select></label></div>'
+        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Hersteller-Chargennummer</span><input class="sg-interaction-element sg-input-single-line" type="text" data-lager-new-manufacturer-lot required></label></div>'
+        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Herstellungsdatum</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-new-mfg-date required></label></div>'
+        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">MHD</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-new-expiry-date required></label></div>'
+        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Einkaufsdatum</span><input class="sg-interaction-element sg-input-single-line" type="date" data-lager-new-purchase-date required></label></div>'
+        . '<div class="sg-form-sections-card__field-group"><label class="sg-labeled-input-row"><span class="sg-label">Eingangsmenge</span><input class="sg-interaction-element sg-input-single-line" type="number" min="1" step="1" inputmode="numeric" data-lager-new-receipt-qty placeholder="Menge" required></label></div>'
         . '</section><footer class="sg-form-sections-card__actions-segment" data-pattern-part="form-actions-segment"><div class="sg-form-sections-card__actions" data-pattern-part="form-actions"><button class="sg-interaction-element sg-button sg-button--active sg-form-sections-card__action" type="button" data-lager-new-lot-close>Abbrechen</button><button class="sg-interaction-element sg-button sg-button--process sg-form-sections-card__action" type="submit">Speichern</button></div></footer><p class="sg-body" data-lager-new-lot-status aria-live="polite"></p></div></form></div></div>'
         . '</article>'
         . '<div data-lager-drawer-topic="open-lots" aria-label="Offene Chargen">' . auth_render_lager_open_lots($lagerProducts, $manufacturerOptions) . '</div>'
@@ -829,14 +839,15 @@ function render_auth_home_page(array $user, array $otcProducts = [], array $best
     echo "  const syncLagerBalanceView = (balance) => { const drawer = getDrawer(); if (!drawer || !balance) { return; } const currentQty = drawer.querySelector('[data-lager-drawer-current-qty]'); const qtyIn = drawer.querySelector('[data-lager-drawer-qty-in]'); if (currentQty) { currentQty.textContent = String(balance.qty_net ?? 0); } if (qtyIn) { qtyIn.textContent = String(balance.qty_in ?? 0); } const trigger = contentRoot.querySelector('[data-lager-drawer-open][aria-expanded=\"true\"]'); if (trigger) { trigger.dataset.lagerDrawerCurrentQty = String(balance.qty_net ?? 0); trigger.dataset.lagerDrawerQtyIn = String(balance.qty_in ?? 0); } };";
     echo "  const clearLagerMovementInputs = () => { const drawer = getDrawer(); if (!drawer) { return; } drawer.querySelectorAll('[data-lager-receipt-qty], [data-lager-adjustment-qty], [data-lager-out-qty]').forEach((input) => { input.value = ''; }); };";
     echo "  const syncLagerOpenLotCard = (lot, balance) => { const drawer = getDrawer(); const card = drawer?.querySelector('[data-lager-open-card=\"' + (lot?.id || '') + '\"]'); if (!card) { return; } const values = { '[data-lager-open-card-lot-number]': lot?.lot_number || 'Nicht hinterlegt', '[data-lager-open-card-qty-net]': String(balance?.qty_net ?? 0), '[data-lager-open-card-qty-in]': String(balance?.qty_net ?? 0), '[data-lager-open-card-manufacturer]': drawer.querySelector('[data-lager-new-manufacturer]')?.selectedOptions?.[0]?.textContent || 'Nicht hinterlegt', '[data-lager-open-card-manufacturer-lot]': lot?.manufacturer_lot_number || 'Nicht hinterlegt', '[data-lager-open-card-mfg-date]': lot?.mfg_date || 'Nicht hinterlegt', '[data-lager-open-card-expiry-date]': lot?.expiry_date || 'Nicht hinterlegt', '[data-lager-open-card-purchase-date]': lot?.purchase_date || 'Nicht hinterlegt' }; Object.entries(values).forEach(([selector, value]) => { const target = card.querySelector(selector); if (target) { target.textContent = value; } }); };";
-    echo "  document.addEventListener('click', (event) => { const trigger = event.target.closest('[data-lager-drawer-open]'); if (!trigger || trigger.dataset.lagerDrawerType !== 'Produkt' || window.matchMedia('(max-width: 767px)').matches) { return; } const drawer = getDrawer(); const productId = trigger.closest('[data-lager-row]')?.dataset.lagerId || ''; const openProduct = drawer?.querySelector('[data-lager-open-product=\"' + productId + '\"]'); drawer?.querySelectorAll('[data-lager-open-product]').forEach((product) => { product.hidden = product !== openProduct; product.querySelectorAll('[data-lager-open-edit-form]').forEach((form) => { form.hidden = true; }); product.querySelectorAll('[data-lager-open-card]').forEach((readView) => { readView.hidden = false; }); }); const newForm = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-form\"]'); const newAction = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-action\"]'); if (newForm) { newForm.hidden = true; } if (newAction) { newAction.hidden = false; } const notificationWrapper = drawer?.querySelector('[data-lager-new-lot-notification-wrapper]'); const notification = drawer?.querySelector('[data-lager-new-lot-notification]'); const shortageQty = trigger.dataset.lagerDrawerVirtualShortageQty || '0'; const hasShortage = shortageQty !== '0' && shortageQty !== '0,00'; if (notificationWrapper) { notificationWrapper.hidden = !hasShortage; } if (notification && hasShortage) { notification.textContent = 'Für dieses Produkt bestehen virtuelle Fehlbestände in Höhe von ' + shortageQty + '. Die Eingangsmenge wird nach Aktivierung der Charge zur Nachallokation verwendet.'; } const setValue = (selector, value) => { const field = drawer?.querySelector(selector); if (field) { field.value = value || ''; } }; setValue('[data-lager-new-lot-number]', trigger.dataset.lagerOpenLotNumber); setValue('[data-lager-new-manufacturer]', trigger.dataset.lagerOpenManufacturerPartyId); setValue('[data-lager-new-manufacturer-lot]', trigger.dataset.lagerOpenManufacturerLotNumber); setValue('[data-lager-new-mfg-date]', trigger.dataset.lagerOpenMfgDate); setValue('[data-lager-new-expiry-date]', trigger.dataset.lagerOpenExpiryDate); setValue('[data-lager-new-purchase-date]', trigger.dataset.lagerOpenPurchaseDate); if (drawer) { drawer.dataset.lagerOpenLotId = trigger.dataset.lagerOpenLotId || ''; drawer.dataset.lagerProductId = productId; } });";
+    echo "  document.addEventListener('click', (event) => { const trigger = event.target.closest('[data-lager-drawer-open]'); if (!trigger || trigger.dataset.lagerDrawerType !== 'Produkt' || window.matchMedia('(max-width: 767px)').matches) { return; } const drawer = getDrawer(); const productId = trigger.closest('[data-lager-row]')?.dataset.lagerId || ''; const openProduct = drawer?.querySelector('[data-lager-open-product=\"' + productId + '\"]'); drawer?.querySelectorAll('[data-lager-open-product]').forEach((product) => { product.hidden = product !== openProduct; product.querySelectorAll('[data-lager-open-edit-form]').forEach((form) => { form.hidden = true; }); product.querySelectorAll('[data-lager-open-card]').forEach((readView) => { readView.hidden = false; }); }); const newForm = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-form\"]'); const newAction = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-action\"]'); if (newForm) { newForm.hidden = true; } if (newAction) { newAction.hidden = false; } const notificationWrapper = drawer?.querySelector('[data-lager-new-lot-notification-wrapper]'); const notification = drawer?.querySelector('[data-lager-new-lot-notification]'); const shortageQty = trigger.dataset.lagerDrawerVirtualShortageQty || '0'; const hasShortage = shortageQty !== '0' && shortageQty !== '0,00'; if (notificationWrapper) { notificationWrapper.hidden = !hasShortage; } if (notification && hasShortage) { notification.textContent = 'Für dieses Produkt bestehen virtuelle Fehlbestände in Höhe von ' + shortageQty + '. Die Eingangsmenge wird nach Aktivierung der Charge zur Nachallokation verwendet.'; } const setValue = (selector, value) => { const field = drawer?.querySelector(selector); if (field) { field.value = value || ''; } }; setValue('[data-lager-new-lot-number]', ''); setValue('[data-lager-new-manufacturer]', ''); setValue('[data-lager-new-manufacturer-lot]', ''); setValue('[data-lager-new-mfg-date]', ''); setValue('[data-lager-new-expiry-date]', ''); setValue('[data-lager-new-purchase-date]', ''); setValue('[data-lager-new-receipt-qty]', ''); if (drawer) { drawer.dataset.lagerOpenLotId = ''; drawer.dataset.lagerProductId = productId; } });";
     echo "  document.addEventListener('click', (event) => { const openButton = event.target.closest('[data-lager-new-lot-open]'); if (openButton) { const drawer = getDrawer(); const form = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-form\"]'); const action = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-action\"]'); if (form) { form.hidden = false; } if (action) { action.hidden = true; } return; } if (event.target.closest('[data-lager-new-lot-close]')) { const drawer = getDrawer(); const form = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-form\"]'); const action = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-action\"]'); if (form) { form.hidden = true; } if (action) { action.hidden = false; } } });";
     echo "  document.addEventListener('click', (event) => { const editButton = event.target.closest('[data-lager-open-edit-open]'); if (editButton) { const card = editButton.closest('[data-lager-open-card-wrapper]'); const form = card?.querySelector('[data-lager-open-edit-form]'); const readView = card?.querySelector('[data-lager-open-card]'); if (form) { form.hidden = false; } if (readView) { readView.hidden = true; } return; } const closeButton = event.target.closest('[data-lager-open-edit-close]'); if (closeButton) { const card = closeButton.closest('[data-lager-open-card-wrapper]'); const form = card?.querySelector('[data-lager-open-edit-form]'); const readView = card?.querySelector('[data-lager-open-card]'); if (form) { form.hidden = true; } if (readView) { readView.hidden = false; } } });";
     echo "  document.addEventListener('input', (event) => { const input = event.target.closest('[data-lager-open-delete-confirmation-input]'); if (!input) { return; } const card = input.closest('[data-lager-open-card-wrapper]'); const submit = card?.querySelector('[data-lager-open-delete-confirmation-submit]'); const valid = input.value === 'DELETE'; if (submit) { submit.disabled = !valid; submit.setAttribute('aria-disabled', String(!valid)); submit.classList.toggle('sg-button--process-inactive', !valid); } });";
+    echo "  document.addEventListener('click', async (event) => { const selectButton = event.target.closest('[data-lager-open-select]'); if (!selectButton) { return; } const card = selectButton.closest('[data-lager-open-card-wrapper]'); const product = card?.closest('[data-lager-open-product]'); const drawer = getDrawer(); const productId = product?.dataset.lagerOpenProduct || drawer?.dataset.lagerProductId || ''; const lotId = card?.dataset.lagerOpenCardWrapper || ''; if (!productId || !lotId) { return; } selectButton.disabled = true; try { await postLagerChange({ action: 'select_open_lot', productId, lotId }); product.querySelectorAll('[data-lager-open-card-wrapper]').forEach((candidate) => { const selected = candidate === card; candidate.classList.toggle('sg-lager-open-lot--next-active', selected); const label = candidate.querySelector('[data-lager-open-card-next-active]'); if (label) { label.textContent = selected ? 'Als nächste aktive Charge ausgewählt' : 'Nicht ausgewählt'; } }); } catch (error) { const status = card?.querySelector('[data-lager-open-edit-status]'); if (status) { status.textContent = error instanceof Error ? error.message : 'Auswahl fehlgeschlagen'; } } finally { selectButton.disabled = false; } });";
     echo "  document.addEventListener('click', async (event) => { const deleteButton = event.target.closest('[data-lager-open-delete]'); if (deleteButton) { const card = deleteButton.closest('[data-lager-open-card-wrapper]'); const confirmation = card?.querySelector('[data-lager-open-delete-confirmation]'); const input = card?.querySelector('[data-lager-open-delete-confirmation-input]'); const submit = card?.querySelector('[data-lager-open-delete-confirmation-submit]'); if (input) { input.value = ''; } if (submit) { submit.disabled = true; submit.setAttribute('aria-disabled', 'true'); submit.classList.add('sg-button--process-inactive'); } if (confirmation) { confirmation.hidden = false; } if (card) { card.dataset.dialogOpen = 'true'; } return; } const cancel = event.target.closest('[data-lager-open-delete-confirmation-cancel]'); if (cancel) { const card = cancel.closest('[data-lager-open-card-wrapper]'); const confirmation = card?.querySelector('[data-lager-open-delete-confirmation]'); if (confirmation) { confirmation.hidden = true; } if (card) { card.dataset.dialogOpen = 'false'; } return; } const submit = event.target.closest('[data-lager-open-delete-confirmation-submit]'); if (!submit || submit.disabled) { return; } const card = submit.closest('[data-lager-open-card-wrapper]'); const confirmation = card?.querySelector('[data-lager-open-delete-confirmation]'); const status = card?.querySelector('[data-lager-open-delete-status]'); if (status) { status.textContent = 'Löschen läuft …'; } submit.disabled = true; try { await postLagerChange({ action: 'delete_open_lot', lotId: card?.dataset.lagerOpenCardWrapper || '' }); const productId = card?.closest('[data-lager-open-product]')?.dataset.lagerOpenProduct || ''; contentRoot.querySelectorAll('[data-lager-drawer-open]').forEach((trigger) => { if (trigger.closest('[data-lager-row]')?.dataset.lagerId === productId) { trigger.dataset.lagerOpenLotId = ''; } }); const drawer = getDrawer(); if (drawer) { drawer.dataset.lagerOpenLotId = ''; } card?.remove(); } catch (error) { if (status) { status.textContent = error instanceof Error ? error.message : 'Löschen fehlgeschlagen'; } submit.disabled = false; } });";
     echo "  document.addEventListener('click', (event) => { const cancel = event.target.closest('[data-lager-open-confirmation-cancel]'); if (cancel) { const card = cancel.closest('[data-lager-open-card-wrapper]'); const confirmation = card?.querySelector('[data-lager-open-confirmation-card]'); if (confirmation) { confirmation.hidden = true; } if (card) { card.dataset.dialogOpen = 'false'; } const form = card?.querySelector('[data-lager-open-edit-form-element]'); if (form) { form.dataset.confirmationAccepted = 'false'; } return; } const confirm = event.target.closest('[data-lager-open-confirmation-submit]'); if (confirm) { const card = confirm.closest('[data-lager-open-card-wrapper]'); const confirmation = card?.querySelector('[data-lager-open-confirmation-card]'); const form = card?.querySelector('[data-lager-open-edit-form-element]'); if (confirmation) { confirmation.hidden = true; } if (card) { card.dataset.dialogOpen = 'false'; } if (form) { form.dataset.confirmationAccepted = 'true'; form.requestSubmit(); } } });";
     echo "  document.addEventListener('submit', async (event) => { const openLotForm = event.target.closest('[data-lager-open-edit-form-element]'); if (!openLotForm) { return; } event.preventDefault(); const drawer = getDrawer(); const card = openLotForm.closest('[data-lager-open-card-wrapper]'); const editSection = card?.querySelector('[data-lager-open-edit-form]'); const fields = [{ label: 'Naurua-Chargennummer', input: openLotForm.querySelector('[data-lager-open-lot-number]') }, { label: 'Hersteller', input: openLotForm.querySelector('[data-lager-open-manufacturer]') }, { label: 'Hersteller-Chargennummer', input: openLotForm.querySelector('[data-lager-open-manufacturer-lot]') }, { label: 'Herstellungsdatum', input: openLotForm.querySelector('[data-lager-open-mfg-date]') }, { label: 'MHD', input: openLotForm.querySelector('[data-lager-open-expiry-date]') }, { label: 'Einkaufsdatum', input: openLotForm.querySelector('[data-lager-open-purchase-date]') }, { label: 'Menge', input: openLotForm.querySelector('[data-lager-open-target-qty]') }]; const emptyFields = fields.filter((field) => (field.input?.value || '').trim() === ''); if (emptyFields.length > 0 && openLotForm.dataset.confirmationAccepted !== 'true') { const confirmation = card?.querySelector('[data-lager-open-confirmation-card]'); const emptyFieldsList = card?.querySelector('[data-lager-open-confirmation-empty-fields]'); if (emptyFieldsList) { emptyFieldsList.replaceChildren(...emptyFields.map((field) => { const item = document.createElement('div'); item.className = 'sg-body'; item.textContent = field.label; return item; })); } if (confirmation) { confirmation.hidden = false; } if (card) { card.dataset.dialogOpen = 'true'; } return; } openLotForm.dataset.confirmationAccepted = 'false'; const status = openLotForm.querySelector('[data-lager-open-edit-status]'); if (status) { status.textContent = 'Speichern läuft …'; } try { const targetQtyInput = openLotForm.querySelector('[data-lager-open-target-qty]'); const result = await postLagerChange({ action: 'prepare_lot', productId: drawer?.dataset.lagerProductId || '', lotId: card?.dataset.lagerOpenCardWrapper || '', lotNumber: openLotForm.querySelector('[data-lager-open-lot-number]')?.value || '', manufacturerPartyId: openLotForm.querySelector('[data-lager-open-manufacturer]')?.value || null, manufacturerLotNumber: openLotForm.querySelector('[data-lager-open-manufacturer-lot]')?.value || '', mfgDate: openLotForm.querySelector('[data-lager-open-mfg-date]')?.value || '', expiryDate: openLotForm.querySelector('[data-lager-open-expiry-date]')?.value || '', purchaseDate: openLotForm.querySelector('[data-lager-open-purchase-date]')?.value || '', targetQty: targetQtyInput?.value.trim() === '' ? '0' : targetQtyInput?.value || '' }); syncLagerOpenLotCard(result.lot, result.balance); if (editSection) { editSection.hidden = true; } card?.querySelector('[data-lager-open-card]')?.removeAttribute('hidden'); if (status) { status.textContent = ''; } } catch (error) { if (status) { status.textContent = error instanceof Error ? error.message : 'Speichern fehlgeschlagen'; } } });";
-    echo "  document.addEventListener('submit', async (event) => { const newLotForm = event.target.closest('[data-lager-new-lot-form-element]'); if (!newLotForm) { return; } event.preventDefault(); const drawer = getDrawer(); const status = drawer?.querySelector('[data-lager-new-lot-status]'); if (status) { status.textContent = 'Speichern läuft …'; } try { const result = await postLagerChange({ action: 'prepare_lot', productId: drawer?.dataset.lagerProductId || '', lotId: drawer?.dataset.lagerOpenLotId || '', lotNumber: drawer?.querySelector('[data-lager-new-lot-number]')?.value || '', manufacturerPartyId: drawer?.querySelector('[data-lager-new-manufacturer]')?.value || null, manufacturerLotNumber: drawer?.querySelector('[data-lager-new-manufacturer-lot]')?.value || '', mfgDate: drawer?.querySelector('[data-lager-new-mfg-date]')?.value || '', expiryDate: drawer?.querySelector('[data-lager-new-expiry-date]')?.value || '', purchaseDate: drawer?.querySelector('[data-lager-new-purchase-date]')?.value || '', receiptQty: drawer?.querySelector('[data-lager-new-receipt-qty]')?.value || '' }); syncLagerOpenLotCard(result.lot, result.balance); const form = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-form\"]'); const action = drawer?.querySelector('[data-lager-drawer-topic=\"new-lot-action\"]'); if (form) { form.hidden = true; } if (action) { action.hidden = false; } if (status) { status.textContent = ''; } } catch (error) { if (status) { status.textContent = error instanceof Error ? error.message : 'Speichern fehlgeschlagen'; } } });";
+    echo "  document.addEventListener('submit', async (event) => { const newLotForm = event.target.closest('[data-lager-new-lot-form-element]'); if (!newLotForm) { return; } event.preventDefault(); const drawer = getDrawer(); const status = drawer?.querySelector('[data-lager-new-lot-status]'); if (status) { status.textContent = 'Speichern läuft …'; } try { await postLagerChange({ action: 'prepare_lot', productId: drawer?.dataset.lagerProductId || '', lotId: '', lotNumber: drawer?.querySelector('[data-lager-new-lot-number]')?.value || '', manufacturerPartyId: drawer?.querySelector('[data-lager-new-manufacturer]')?.value || null, manufacturerLotNumber: drawer?.querySelector('[data-lager-new-manufacturer-lot]')?.value || '', mfgDate: drawer?.querySelector('[data-lager-new-mfg-date]')?.value || '', expiryDate: drawer?.querySelector('[data-lager-new-expiry-date]')?.value || '', purchaseDate: drawer?.querySelector('[data-lager-new-purchase-date]')?.value || '', receiptQty: drawer?.querySelector('[data-lager-new-receipt-qty]')?.value || '' }); window.location.reload(); } catch (error) { if (status) { status.textContent = error instanceof Error ? error.message : 'Speichern fehlgeschlagen'; } } });";
     echo "  document.addEventListener('submit', async (event) => { const editForm = event.target.closest('[data-lager-edit-form-element]'); if (!editForm) { return; } event.preventDefault(); const drawer = getDrawer(); const status = drawer?.querySelector('[data-lager-edit-status]'); if (status) { status.textContent = 'Speichern läuft …'; } try { const result = await postLagerChange({ action: 'update_lot', lotId: drawer?.dataset.lagerActiveLotId || '', manufacturerPartyId: drawer?.querySelector('[data-lager-manufacturer]')?.value || null, manufacturerLotNumber: drawer?.querySelector('[data-lager-manufacturer-lot]')?.value || '', mfgDate: drawer?.querySelector('[data-lager-mfg-date]')?.value || '', expiryDate: drawer?.querySelector('[data-lager-expiry-date]')?.value || '', purchaseDate: drawer?.querySelector('[data-lager-purchase-date]')?.value || '', receiptQty: drawer?.querySelector('[data-lager-receipt-qty]')?.value || '', adjustmentQty: drawer?.querySelector('[data-lager-adjustment-qty]')?.value || '', outQty: drawer?.querySelector('[data-lager-out-qty]')?.value || '' }); syncLagerReadView(); syncLagerBalanceView(result.balance); clearLagerMovementInputs(); setLagerEditMode(false); if (status) { status.textContent = ''; } } catch (error) { if (status) { status.textContent = error instanceof Error ? error.message : 'Speichern fehlgeschlagen'; } } });";
     echo "  document.addEventListener('click', (event) => { if (event.target.closest('[data-lager-detail-back]')) { event.preventDefault(); closeLagerMobileDetail(); } });";
     echo "  document.addEventListener('keydown', (event) => { if (event.key === 'Escape') { closeDrawer(); closeLagerMobileDetail(); } });";