diff --git a/modules/axelor-open-suite/axelor-supplier-management/src/main/java/com/axelor/apps/suppliermanagement/service/PurchaseOrderSupplierService.java b/modules/axelor-open-suite/axelor-supplier-management/src/main/java/com/axelor/apps/suppliermanagement/service/PurchaseOrderSupplierService.java
index 026c6809..27cd351d 100644
--- a/modules/axelor-open-suite/axelor-supplier-management/src/main/java/com/axelor/apps/suppliermanagement/service/PurchaseOrderSupplierService.java
+++ b/modules/axelor-open-suite/axelor-supplier-management/src/main/java/com/axelor/apps/suppliermanagement/service/PurchaseOrderSupplierService.java
@@ -321,6 +321,8 @@ public class PurchaseOrderSupplierService {
               PurchaseOrderLineNew.setDiscountAmount(purchaseOrderLine.getDiscountAmount());
               PurchaseOrderLineNew.setDiscountTypeSelect(purchaseOrderLine.getDiscountTypeSelect());
               PurchaseOrderLineNew.setSupplierPartner(purchaseOrderLine.getSupplierPartner());
+              // set taxline to children
+              PurchaseOrderLineNew.setTaxLine(purchaseOrderLine.getTaxLine());
 
   return PurchaseOrderLineNew ;
   }