diff --git a/erpnext/manufacturing/doctype/production_plan/production_plan.py b/erpnext/manufacturing/doctype/production_plan/production_plan.py
index 39c21089f3b..c4b0aa26fce 100644
--- a/erpnext/manufacturing/doctype/production_plan/production_plan.py
+++ b/erpnext/manufacturing/doctype/production_plan/production_plan.py
@@ -1308,7 +1308,7 @@ def get_material_request_items(
 	required_qty = 0
 	item_code = row.get("item_code")
 
-	if not ignore_existing_ordered_qty or bin_dict.get("projected_qty", 0) < 0:
+	if ignore_existing_ordered_qty or bin_dict.get("projected_qty", 0) < 0:
 		required_qty = flt(row.get("qty"))
 	else:
 		key = (item_code, warehouse)
diff --git a/erpnext/manufacturing/doctype/production_plan/test_production_plan.py b/erpnext/manufacturing/doctype/production_plan/test_production_plan.py
index 20ae8ba6763..5505be3cafa 100644
--- a/erpnext/manufacturing/doctype/production_plan/test_production_plan.py
+++ b/erpnext/manufacturing/doctype/production_plan/test_production_plan.py
@@ -173,7 +173,7 @@ class TestProductionPlan(FrappeTestCase):
 				"company": "_Test Company",
 				"posting_date": nowdate(),
 				"get_items_from": "Sales Order",
-				"ignore_existing_ordered_qty": 1,
+				"ignore_existing_ordered_qty": 0,
 			}
 		)
 		pln.append(