fix: do not check for sub assembly reference for rm of fg (backport #53758) (#53759)

Co-authored-by: Mihir Kandoi <kandoimihir@gmail.com>
fix: do not check for sub assembly reference for rm of fg (#53758)

Author: mergify[bot]

erpnext/manufacturing/doctype/production_plan/production_plan.py

@@ -616,7 +616,12 @@ def add_reference_to_raw_materials(self):
 				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."