need to resyn the po if the m18Lot not match, if not the whole PO cannot create GRN

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

@@ -63,6 +63,7 @@ import com.ffii.fpsms.m18.model.GoodsReceiptNoteAntValue
 import com.ffii.fpsms.m18.entity.M18GoodsReceiptNoteLog
 import com.ffii.fpsms.m18.entity.M18GoodsReceiptNoteLogRepository
 import com.ffii.fpsms.m18.service.M18GoodsReceiptNoteService
+import com.ffii.fpsms.m18.service.M18PurchaseOrderService
 import com.ffii.fpsms.m18.utils.CommonUtils
 import com.google.gson.Gson
 import org.slf4j.LoggerFactory
@@ -97,6 +98,7 @@ open class StockInLineService(
     private val inventoryRepository: InventoryRepository,
     private val m18GoodsReceiptNoteService: M18GoodsReceiptNoteService,
     private val m18GoodsReceiptNoteLogRepository: M18GoodsReceiptNoteLogRepository,
+    private val m18PurchaseOrderService: M18PurchaseOrderService,
 ) : AbstractBaseEntityService<StockInLine, Long, StockInLineRepository>(jdbcDao, stockInLineRepository) {
 
     private val logger = LoggerFactory.getLogger(StockInLineService::class.java)
@@ -502,6 +504,46 @@ open class StockInLineService(
         return poRepository.saveAndFlush(po)
     }
 
+    /**
+     * Calls M18 GET `/root/api/read/po?id={m18PoId}` (same as [M18PurchaseOrderService.getPurchaseOrder]) using
+     * [PurchaseOrder.m18DataLog].m18Id, compares each local POL's [PurchaseOrderLine.m18Lot] to M18 `pot[].lot`
+     * (matched by POL [com.ffii.fpsms.m18.entity.M18DataLog.m18Id] == M18 line id), and persists updates when different.
+     * Run before building the GRN so `sourceLot` matches M18.
+     */
+    private fun syncPurchaseOrderLineM18LotFromM18(po: PurchaseOrder) {
+        val m18PoId = po.m18DataLog?.m18Id ?: run {
+            logger.debug("[GRN m18Lot sync] PO id=${po.id} code=${po.code} has no m18DataLog.m18Id, skip")
+            return
+        }
+        val response = try {
+            m18PurchaseOrderService.getPurchaseOrder(m18PoId)
+        } catch (e: Exception) {
+            logger.warn("[GRN m18Lot sync] read/po failed m18PoId=$m18PoId PO=${po.code}: ${e.message}")
+            null
+        } ?: return
+
+        val pot = response.data?.pot ?: return
+        if (pot.isEmpty()) return
+
+        val lotByM18LineId = pot.associate { it.id to (it.lot ?: "").trim() }
+        val pols = polRepository.findAllByPurchaseOrderIdAndDeletedIsFalseAndM18DataLogIsNotNull(po.id!!)
+        var changed = 0
+        for (pol in pols) {
+            val m18LineId = pol.m18DataLog?.m18Id ?: continue
+            if (!lotByM18LineId.containsKey(m18LineId)) continue
+            val remoteLot = lotByM18LineId[m18LineId]!!
+            val localLot = (pol.m18Lot ?: "").trim()
+            if (localLot == remoteLot) continue
+            logger.info("[GRN m18Lot sync] PO ${po.code} POL id=${pol.id} m18LineId=$m18LineId: local m18Lot='$localLot' -> M18 lot='$remoteLot'")
+            pol.m18Lot = if (remoteLot.isEmpty()) null else remoteLot
+            polRepository.saveAndFlush(pol)
+            changed++
+        }
+        if (changed > 0) {
+            logger.info("[GRN m18Lot sync] Updated m18Lot on $changed POL row(s) for PO id=${po.id} code=${po.code}")
+        }
+    }
+
     /**
      * Builds M18 Goods Receipt Note (AN) request from completed PO and its completed stock-in lines.
      */
@@ -631,6 +673,9 @@ open class StockInLineService(
         logger.info("[updatePurchaseOrderStatus] savedPo id=${savedPo.id}, status=${savedPo.status}")
         // TODO: For test only - normally check savedPo.status == PurchaseOrderStatus.COMPLETED and use only COMPLETE lines
         try {
+            // Align POL.m18Lot with M18 before GRN (sourceLot must match M18 PO line lot or AN save may fail).
+            syncPurchaseOrderLineM18LotFromM18(savedPo)
+
             // Defensive: load only completed stock-in lines for the PO, so GRN payload can't include pending/escalated.
             val linesForGrn = stockInLineRepository.findCompletedByPurchaseOrderIdAndDeletedFalseWithItemNames(savedPo.id!!)
             if (linesForGrn.isEmpty()) {