diff --git a/erpnext/manufacturing/doctype/production_plan/production_plan.py b/erpnext/manufacturing/doctype/production_plan/production_plan.py
index 30b3968fc80..1dfc064b2a4 100644
--- a/erpnext/manufacturing/doctype/production_plan/production_plan.py
+++ b/erpnext/manufacturing/doctype/production_plan/production_plan.py
@@ -616,7 +616,12 @@ class ProductionPlan(Document):
 				None,
 			):
 				item.db_set("sub_assembly_item_reference", reference)
-			elif self.reserve_stock and item.main_item_code and item.from_bom:
+			elif (
+				self.reserve_stock
+				and item.main_item_code
+				and item.from_bom
+				and item.main_item_code != frappe.get_cached_value("BOM", item.from_bom, "item")
+			):
 				frappe.throw(
 					_(
 						"Sub assembly item references are missing. Please fetch the sub assemblies and raw materials again."