diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index 414f98c961..1b8f66c897 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -3251,7 +3251,10 @@ def update_child_qty_rate(parent_doctype, trans_items, parent_doctype_name, chil
 
 	if parent_doctype == "Purchase Order":
 		update_last_purchase_rate(parent, is_submit=1)
-		parent.update_prevdoc_status()
+
+		if any_qty_changed or items_added_or_removed or any_conversion_factor_changed:
+			parent.update_prevdoc_status()
+
 		parent.update_requested_qty()
 		parent.update_ordered_qty()
 		parent.update_ordered_and_reserved_qty()