diff --git a/erpnext/manufacturing/doctype/bom/bom.py b/erpnext/manufacturing/doctype/bom/bom.py
index ff12c04e63..4b7f7f2bf7 100644
--- a/erpnext/manufacturing/doctype/bom/bom.py
+++ b/erpnext/manufacturing/doctype/bom/bom.py
@@ -124,22 +124,17 @@ class BOM(Document):
 		if self.docstatus == 2:
 			return
 
-		items_rate = frappe._dict()
 		for d in self.get("items"):
 			rate = self.get_bom_material_detail({'item_code': d.item_code, 'bom_no': d.bom_no,
 				'qty': d.qty})["rate"]
 			if rate:
 				d.rate = rate
-				items_rate.setdefault(d.item_code, d.rate)
-
-		for e in self.get("exploded_items"):
-			if items_rate.get(e.item_code):
-				e.rate = items_rate.get(e.item_code)
 
 		if self.docstatus == 1:
 			self.flags.ignore_validate_update_after_submit = True
 			self.calculate_cost()
 		self.save()
+		self.update_exploded_items()
 
 		frappe.msgprint(_("Cost Updated"))