diff --git a/erpnext/manufacturing/doctype/bom/bom.py b/erpnext/manufacturing/doctype/bom/bom.py
index ff84991..580838e 100644
--- a/erpnext/manufacturing/doctype/bom/bom.py
+++ b/erpnext/manufacturing/doctype/bom/bom.py
@@ -385,6 +385,7 @@
 		if self.docstatus == 2:
 			return
 
+		self.flags.cost_updated = False
 		existing_bom_cost = self.total_cost
 
 		if self.docstatus == 1:
@@ -407,7 +408,11 @@
 				frappe.get_doc("BOM", bom).update_cost(from_child_bom=True)
 
 		if not from_child_bom:
-			frappe.msgprint(_("Cost Updated"), alert=True)
+			msg = "Cost Updated"
+			if not self.flags.cost_updated:
+				msg = "No changes in cost found"
+
+			frappe.msgprint(_(msg), alert=True)
 
 	def update_parent_cost(self):
 		if self.total_cost:
@@ -593,11 +598,16 @@
 			# not via doc event, table is not regenerated and needs updation
 			self.calculate_exploded_cost()
 
+		old_cost = self.total_cost
+
 		self.total_cost = self.operating_cost + self.raw_material_cost - self.scrap_material_cost
 		self.base_total_cost = (
 			self.base_operating_cost + self.base_raw_material_cost - self.base_scrap_material_cost
 		)
 
+		if self.total_cost != old_cost:
+			self.flags.cost_updated = True
+
 	def calculate_op_cost(self, update_hour_rate=False):
 		"""Update workstation rate and calculates totals"""
 		self.operating_cost = 0
diff --git a/erpnext/manufacturing/doctype/bom/test_bom.py b/erpnext/manufacturing/doctype/bom/test_bom.py
index 27f3cc9..e34ac12 100644
--- a/erpnext/manufacturing/doctype/bom/test_bom.py
+++ b/erpnext/manufacturing/doctype/bom/test_bom.py
@@ -9,7 +9,10 @@
 from frappe.tests.utils import FrappeTestCase
 from frappe.utils import cstr, flt
 
-from erpnext.controllers.tests.test_subcontracting_controller import set_backflush_based_on
+from erpnext.controllers.tests.test_subcontracting_controller import (
+	make_stock_in_entry,
+	set_backflush_based_on,
+)
 from erpnext.manufacturing.doctype.bom.bom import BOMRecursionError, item_query, make_variant_bom
 from erpnext.manufacturing.doctype.bom_update_log.test_bom_update_log import (
 	update_cost_in_all_boms_in_test,
@@ -639,6 +642,28 @@
 		bom.submit()
 		self.assertEqual(bom.exploded_items[0].rate, bom.items[0].base_rate)
 
+	def test_bom_cost_update_flag(self):
+		rm_item = make_item(
+			properties={"is_stock_item": 1, "valuation_rate": 99, "last_purchase_rate": 89}
+		).name
+		fg_item = make_item(properties={"is_stock_item": 1}).name
+
+		from erpnext.manufacturing.doctype.production_plan.test_production_plan import make_bom
+
+		bom = make_bom(item=fg_item, raw_materials=[rm_item])
+
+		create_stock_reconciliation(
+			item_code=rm_item, warehouse="_Test Warehouse - _TC", qty=100, rate=600
+		)
+
+		bom.load_from_db()
+		bom.update_cost()
+		self.assertTrue(bom.flags.cost_updated)
+
+		bom.load_from_db()
+		bom.update_cost()
+		self.assertFalse(bom.flags.cost_updated)
+
 
 def get_default_bom(item_code="_Test FG Item 2"):
 	return frappe.db.get_value("BOM", {"item": item_code, "is_active": 1, "is_default": 1})