diff --git a/src/main/java/com/ffii/fpsms/m18/service/M18PurchaseOrderService.kt b/src/main/java/com/ffii/fpsms/m18/service/M18PurchaseOrderService.kt
index 4cc5237..e805eb0 100644
--- a/src/main/java/com/ffii/fpsms/m18/service/M18PurchaseOrderService.kt
+++ b/src/main/java/com/ffii/fpsms/m18/service/M18PurchaseOrderService.kt
@@ -315,6 +315,19 @@ open class M18PurchaseOrderService(
                             val latestPurchaseOrderLog =
                                 m18DataLogService.findLatestM18DataLogWithSuccess(m18PurchaseOrderId, poRefType)
 
+                            val existingPurchaseOrderForSync =
+                                latestPurchaseOrderLog?.id?.let { purchaseOrderService.findByM18DataLogId(it) }
+                            if (existingPurchaseOrderForSync != null &&
+                                existingPurchaseOrderForSync.status != PurchaseOrderStatus.PENDING
+                            ) {
+                                logger.info(
+                                    "${poRefType}: Skipping M18 sync — local PO id=${existingPurchaseOrderForSync.id} " +
+                                        "code=${existingPurchaseOrderForSync.code} status=${existingPurchaseOrderForSync.status?.value} " +
+                                        "(only pending may be overwritten). M18 ID: $m18PurchaseOrderId"
+                                )
+                                return@forEach
+                            }
+
 //                            logger.info(latestPurchaseOrderLog.toString())
                             // Save to m18_data_log table
 //                            logger.info("${poRefType}: Saving for M18 Data Log...")
@@ -336,10 +349,9 @@ open class M18PurchaseOrderService(
 //                    logger.info("${poRefType}: Saved M18 Data Log. ID: ${saveM18PurchaseOrderLog.id}")
 
                             try {
-                                // Find the purchase_order if exist
+                                // Find the purchase_order if exist (re-use lookup from pending guard above)
 //                                logger.info("${poRefType}: Finding exising purchase order...")
-                                val existingPurchaseOrder =
-                                    latestPurchaseOrderLog?.id?.let { purchaseOrderService.findByM18DataLogId(it) }
+                                val existingPurchaseOrder = existingPurchaseOrderForSync
 //                                logger.info("${poRefType}: Exising purchase order ID: ${existingPurchaseOrder?.id}")
 
                                 // Save to purchase_order table