1、采购订单入库/退货时串码判断优化，只有入库订单才判断是否会串码重复；

app/admin/models/purchase.go

@@ -1644,7 +1644,7 @@ func checkPurchaseInventory(req *ErpPurchaseInventoryReq, imeiCheckFlag bool) er
 		}
 
 		// 如果该商品是串码商品，判断其串码是否会重复
-		if inventory.IMEI != "" {
+		if inventory.IMEI != "" && req.PurchaseType == ErpProcureOrder {
 			exist, err := QueryRecordExist(fmt.Sprintf("SELECT * FROM erp_stock_commodity WHERE FIND_IN_SET('%s', imei) > 0", inventory.IMEI))
 			if err != nil {
 				logger.Error("exist sn err")