fixing the GRN duplicated item bug for same PO

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

@@ -835,7 +835,7 @@ open class StockInLineService(
             syncPurchaseOrderLineM18LotFromM18(savedPo)
 
             // Completed lines for GRN: either this receipt date only (multi-delivery POs) or all completed on PO (legacy).
-            val linesForGrn = if (grnReceiptDate != null) {
+            val candidateLines = if (grnReceiptDate != null) {
                 stockInLineRepository.findCompletedByPurchaseOrderIdAndReceiptDateAndDeletedFalseWithItemNames(
                     savedPo.id!!,
                     grnReceiptDate,
@@ -843,20 +843,29 @@ open class StockInLineService(
             } else {
                 stockInLineRepository.findCompletedByPurchaseOrderIdAndDeletedFalseWithItemNames(savedPo.id!!)
             }
-            if (linesForGrn.isEmpty()) {
+            if (candidateLines.isEmpty()) {
                 logger.info("[tryUpdatePurchaseOrderAndCreateGrnIfCompleted] DEBUG: Skipping M18 GRN - no stock-in lines for PO id=${savedPo.id} code=${savedPo.code}")
                 return
             }
-            if (grnReceiptDate != null && linesForGrn.all { sil ->
-                    val id = sil.id ?: return@all false
-                    m18GoodsReceiptNoteLogRepository.existsByStockInLineIdAndStatusTrue(id)
-                }) {
+            val linesForGrn = candidateLines.filter { sil ->
+                val id = sil.id ?: return@filter true
+                !m18GoodsReceiptNoteLogRepository.existsByStockInLineIdAndStatusTrue(id)
+            }
+            if (linesForGrn.isEmpty()) {
                 logger.info(
-                    "[tryUpdatePurchaseOrderAndCreateGrnIfCompleted] Skipping M18 GRN — all ${linesForGrn.size} line(s) for PO id=${savedPo.id} " +
-                        "code=${savedPo.code} on receipt date $grnReceiptDate already have successful GRN logs"
+                    "[tryUpdatePurchaseOrderAndCreateGrnIfCompleted] Skipping M18 GRN — all ${candidateLines.size} line(s) for PO id=${savedPo.id} " +
+                        "code=${savedPo.code}${grnReceiptDate?.let { " on receipt date $it" } ?: ""} already have successful GRN logs"
                 )
                 return
             }
+            val alreadySyncedCount = candidateLines.size - linesForGrn.size
+            if (alreadySyncedCount > 0) {
+                logger.info(
+                    "[tryUpdatePurchaseOrderAndCreateGrnIfCompleted] PO id=${savedPo.id} code=${savedPo.code}: " +
+                        "excluding $alreadySyncedCount stock-in line(s) already in successful M18 GRN log; " +
+                        "sending ${linesForGrn.size} new line(s)${grnReceiptDate?.let { " for receipt date $it" } ?: ""}"
+                )
+            }
             if (savedPo.m18BeId == null || savedPo.supplier?.m18Id == null || savedPo.currency?.m18Id == null) {
                 logger.info("[tryUpdatePurchaseOrderAndCreateGrnIfCompleted] DEBUG: Skipping M18 GRN - missing M18 ids for PO id=${savedPo.id} code=${savedPo.code}. m18BeId=${savedPo.m18BeId}, supplier.m18Id=${savedPo.supplier?.m18Id}, currency.m18Id=${savedPo.currency?.m18Id}")
                 return