diff --git a/src/main/java/com/ffii/fpsms/modules/stock/service/StockAdjustmentService.kt b/src/main/java/com/ffii/fpsms/modules/stock/service/StockAdjustmentService.kt
index a09f635..f997f28 100644
--- a/src/main/java/com/ffii/fpsms/modules/stock/service/StockAdjustmentService.kt
+++ b/src/main/java/com/ffii/fpsms/modules/stock/service/StockAdjustmentService.kt
@@ -66,11 +66,14 @@ open class StockAdjustmentService(
             if (diff.compareTo(BigDecimal.ZERO) == 0) continue // Branch 1: no change
 
             if (diff.compareTo(BigDecimal.ZERO) > 0) {
-                // Branch 2 (qty up): createStockIn
+                // Branch 2 (qty up): increase inQty on the same lot line; new StockIn/StockInLine for audit only
                 val inventoryLotLine = inventoryLotLineRepository.findById(current.id)
                     .orElseThrow { IllegalArgumentException("InventoryLotLine not found: ${current.id}") }
                 val stockInRequest = buildStockInRequestFromExistingLotLine(inventoryLotLine, diff)
-                val stockInLine = stockInLineService.createStockIn(stockInRequest)
+                val stockInLine = stockInLineService.createStockInForExistingInventoryLotLine(
+                    stockInRequest,
+                    inventoryLotLine
+                )
                 saveAdjustmentRecordForStockIn(stockInLine)
             } else {
                 // Branch 3 (qty down): adjustment outbound only (not pick createStockOut)