diff --git a/erpnext/manufacturing/doctype/production_plan/production_plan.py b/erpnext/manufacturing/doctype/production_plan/production_plan.py
index 68360b696c0..fb8c8039d98 100644
--- a/erpnext/manufacturing/doctype/production_plan/production_plan.py
+++ b/erpnext/manufacturing/doctype/production_plan/production_plan.py
@@ -1631,7 +1631,7 @@ def get_items_for_material_requests(doc, warehouses=None, get_parent_warehouse_d
 				}
 			)
 
-		sales_order = doc.get("sales_order")
+		sales_order = data.get("sales_order")
 
 		for item_code, details in item_details.items():
 			so_item_details.setdefault(sales_order, frappe._dict())