diff --git a/modules/erp/lager/api/lot.php b/modules/erp/lager/api/lot.php
index ca141cf..106c04a 100644
--- a/modules/erp/lager/api/lot.php
+++ b/modules/erp/lager/api/lot.php
@@ -126,7 +126,7 @@ try {
             $lotNumber === ''
         );
         sync_open_lot_activation_selection($pdo, $productId);
-        if (promote_open_lot_when_virtual_shortage_is_current($pdo, $productId, $lotId)) {
+        if (promote_open_lot_when_virtual_shortage_is_current($pdo, $productId, $lotId, (string) ($currentUser['username'] ?? $currentUser['email'] ?? 'unknown'))) {
             $preparedLot['status'] = 'current';
             $preparedLot['next_active'] = false;
         } else {
diff --git a/modules/erp/lager/service.php b/modules/erp/lager/service.php
index adb6eb3..8c09ef2 100644
--- a/modules/erp/lager/service.php
+++ b/modules/erp/lager/service.php
@@ -590,7 +590,7 @@ function sync_open_lot_activation_selection(PDO $pdo, int $productId): void
     }
 }
 
-function promote_open_lot_when_virtual_shortage_is_current(PDO $pdo, int $productId, int $lotId): bool
+function promote_open_lot_when_virtual_shortage_is_current(PDO $pdo, int $productId, int $lotId, string $changedBy): bool
 {
     $startedTransaction = !$pdo->inTransaction();
     if ($startedTransaction) {
@@ -608,7 +608,8 @@ function promote_open_lot_when_virtual_shortage_is_current(PDO $pdo, int $produc
              FOR UPDATE"
         );
         $currentStmt->execute([':product_id' => $productId]);
-        if ($currentStmt->fetchColumn() === false || !is_qualified_open_lot($pdo, $lotId)) {
+        $virtualShortageLotId = $currentStmt->fetchColumn();
+        if ($virtualShortageLotId === false || !is_qualified_open_lot($pdo, $lotId)) {
             if ($startedTransaction) {
                 $pdo->commit();
             }
@@ -675,6 +676,14 @@ function promote_open_lot_when_virtual_shortage_is_current(PDO $pdo, int $produc
         );
         $promoteStmt->execute([':lot_id' => $lotId]);
 
+        reconcile_virtual_shortage_allocations(
+            $pdo,
+            (int) $virtualShortageLotId,
+            $lotId,
+            $changedBy,
+            'Automatische Verrechnung bei Aktivierung einer echten Charge'
+        );
+
         if ($startedTransaction) {
             $pdo->commit();
         }
@@ -687,6 +696,78 @@ function promote_open_lot_when_virtual_shortage_is_current(PDO $pdo, int $produc
     }
 }
 
+function reconcile_virtual_shortage_allocations(
+    PDO $pdo,
+    int $virtualLotId,
+    int $realLotId,
+    string $changedBy,
+    string $reason
+): void {
+    $allocationStmt = $pdo->prepare(
+        "SELECT id, qty
+         FROM sales_order_line_lot_allocation
+         WHERE lot_id = :lot_id
+           AND allocation_status = 'reserved'
+         ORDER BY id
+         FOR UPDATE"
+    );
+    $allocationStmt->execute([':lot_id' => $virtualLotId]);
+    $allocations = $allocationStmt->fetchAll();
+
+    foreach ($allocations as $allocation) {
+        $balanceStmt = $pdo->prepare(
+            "SELECT COALESCE(qty_net, 0)
+             FROM v_stock_lot_balance
+             WHERE stock_lot_id = :lot_id"
+        );
+        $balanceStmt->execute([':lot_id' => $realLotId]);
+        $availableQty = (float) ($balanceStmt->fetchColumn() ?: 0);
+        if ($availableQty <= 0.0000001) {
+            break;
+        }
+
+        $replaceQty = min((float) $allocation['qty'], $availableQty);
+        replace_virtual_lot_allocation(
+            $pdo,
+            (int) $allocation['id'],
+            $realLotId,
+            $replaceQty,
+            $changedBy,
+            $reason
+        );
+    }
+
+    $remainingStmt = $pdo->prepare(
+        "SELECT COUNT(*)
+         FROM sales_order_line_lot_allocation
+         WHERE lot_id = :lot_id
+           AND allocation_status = 'reserved'"
+    );
+    $remainingStmt->execute([':lot_id' => $virtualLotId]);
+    if ((int) $remainingStmt->fetchColumn() !== 0) {
+        return;
+    }
+
+    $closeStmt = $pdo->prepare(
+        "UPDATE stock_lot
+         SET status = 'closed', next_active = FALSE, updated_at = NOW()
+         WHERE id = :lot_id
+           AND status = 'virtual_shortage'"
+    );
+    $closeStmt->execute([':lot_id' => $virtualLotId]);
+    if ($closeStmt->rowCount() !== 1) {
+        throw new RuntimeException('Virtuelle Fehlbestandscharge konnte nicht aufgeloest werden');
+    }
+    system_write_audit_log($pdo, 'stock_lot', (string) $virtualLotId, 'closed', $changedBy, [
+        'status' => 'virtual_shortage',
+    ], [
+        'status' => 'closed',
+    ], [
+        'module' => 'erp.lager',
+        'reason' => $reason,
+    ]);
+}
+
 function select_open_lot_for_activation(PDO $pdo, int $productId, int $lotId): void
 {
     if ($productId <= 0 || $lotId <= 0) {
@@ -1217,8 +1298,7 @@ function replace_virtual_lot_allocation(
         $balanceStmt = $pdo->prepare(
             "SELECT COALESCE(v.qty_net, 0)
              FROM v_stock_lot_balance v
-             WHERE v.stock_lot_id = :lot_id
-             FOR UPDATE"
+             WHERE v.stock_lot_id = :lot_id"
         );
         $balanceStmt->execute([':lot_id' => $realLotId]);
         $available = (float) ($balanceStmt->fetchColumn() ?: 0);