updated stock out ledger record, sync same pattern with stock in one

src/main/java/com/ffii/fpsms/modules/stock/service/StockOutLineService.kt

@@ -1329,29 +1329,31 @@ if (submitQty > BigDecimal.ZERO && actualInventoryLotLineId != null) {
         )
     }
 }
-@Transactional
-private fun createStockLedgerForStockOut(stockOutLine: StockOutLine) {
-    val item = stockOutLine.item ?: return
-    val inventory = inventoryRepository.findByItemId(item.id!!).orElse(null) ?: return
-    
-    val outQty = stockOutLine.qty?.toDouble() ?: 0.0
-    // 直接使用 inventory.onHandQty 作为 balance（已经是更新后的值）
-    val newBalance = (inventory.onHandQty ?: BigDecimal.ZERO).toDouble()
-    
-    val stockLedger = StockLedger().apply {
-        this.stockOutLine = stockOutLine
-        this.inventory = inventory
-        this.inQty = null
-        this.outQty = outQty
-        this.balance = newBalance
-        this.type = stockOutLine.type
-        this.itemId = item.id
-        this.itemCode = item.code
-        this.date = LocalDate.now()
+    @Transactional
+    private fun createStockLedgerForStockOut(stockOutLine: StockOutLine) {
+        val item = stockOutLine.item ?: return
+        val inventory = inventoryRepository.findByItemId(item.id!!).orElse(null) ?: return
+
+        val outQty = stockOutLine.qty?.toDouble() ?: 0.0
+        // Use latest ledger balance (same pattern as createStockLedgerForStockIn) so balance is correct when multiple actions run in one transaction
+        val latestLedger = stockLedgerRepository.findLatestByItemId(item.id!!).firstOrNull()
+        val previousBalance = latestLedger?.balance ?: (inventory.onHandQty ?: BigDecimal.ZERO).toDouble()
+        val newBalance = previousBalance - outQty
+
+        val stockLedger = StockLedger().apply {
+            this.stockOutLine = stockOutLine
+            this.inventory = inventory
+            this.inQty = null
+            this.outQty = outQty
+            this.balance = newBalance
+            this.type = stockOutLine.type
+            this.itemId = item.id
+            this.itemCode = item.code
+            this.date = LocalDate.now()
+        }
+
+        stockLedgerRepository.saveAndFlush(stockLedger)
     }
-    
-    stockLedgerRepository.saveAndFlush(stockLedger)
-}
 
     open fun createStockOut(request: StockOutRequest): StockOutLine {