diff --git a/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.py b/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.py
index bccd29c822a..5aa2faed1a1 100644
--- a/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.py
+++ b/erpnext/accounts/doctype/purchase_invoice/test_purchase_invoice.py
@@ -2924,6 +2924,24 @@ class TestPurchaseInvoice(FrappeTestCase, StockTestMixin):
 		# Test 4 - Since this PI is overbilled by 130% and only 120% is allowed, it will fail
 		self.assertRaises(frappe.ValidationError, pi.submit)
 
+	@change_settings("Accounts Settings", {"over_billing_allowance": 0})
+	def test_non_stock_item_over_billing_against_po_is_blocked(self):
+		service_item = create_item(
+			"_Test Service Item Non Stock PI",
+			is_stock_item=0,
+			is_purchase_item=1,
+		).name
+
+		po = create_purchase_order(item_code=service_item, qty=5, rate=100, do_not_save=False)
+		po.submit()
+
+		pi = make_pi_from_po(po.name)
+		pi.items[0].qty = 10  # overbill by 100 %
+		pi.save()
+
+		with self.assertRaises(frappe.ValidationError):
+			pi.submit()
+
 	def test_discount_percentage_not_set_when_amount_is_manually_set(self):
 		pi = make_purchase_invoice(do_not_save=True)
 		discount_amount = 7
diff --git a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
index 6f51e27f532..0b1f1e922bf 100644
--- a/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
@@ -3700,6 +3700,51 @@ class TestSalesInvoice(FrappeTestCase):
 		self.assertTrue("cannot overbill" in str(err.exception).lower())
 		dn.cancel()
 
+	@change_settings("Accounts Settings", {"over_billing_allowance": 0})
+	def test_non_stock_item_over_billing_against_so_is_blocked(self):
+		from erpnext.selling.doctype.sales_order.sales_order import make_sales_invoice as make_si_from_so
+		from erpnext.selling.doctype.sales_order.test_sales_order import make_sales_order
+
+		service_item = create_item(
+			"_Test Service Item Non Stock SI",
+			is_stock_item=0,
+		).name
+
+		so = make_sales_order(item_code=service_item, qty=5, rate=100)
+		so.submit()
+
+		si = make_si_from_so(so.name)
+		si.items[0].qty = 10  # overbill by 100 %
+		si.save()
+
+		with self.assertRaises(frappe.ValidationError):
+			si.submit()
+
+	@change_settings("Accounts Settings", {"over_billing_allowance": 0})
+	def test_non_stock_item_over_billing_against_so_from_quotation_is_blocked(self):
+		from erpnext.selling.doctype.quotation.quotation import make_sales_order as make_so_from_quotation
+		from erpnext.selling.doctype.quotation.test_quotation import make_quotation
+		from erpnext.selling.doctype.sales_order.sales_order import make_sales_invoice as make_si_from_so
+
+		service_item = create_item(
+			"_Test Service Item Non Stock SI Quot",
+			is_stock_item=0,
+		).name
+
+		quotation = make_quotation(item_code=service_item, qty=5, rate=100)
+
+		so = make_so_from_quotation(quotation.name)
+		so.delivery_date = frappe.utils.add_days(frappe.utils.today(), 7)
+		so.insert()
+		so.submit()
+
+		si = make_si_from_so(so.name)
+		si.items[0].qty = 10  # overbill by 100 %
+		si.save()
+
+		with self.assertRaises(frappe.ValidationError):
+			si.submit()
+
 	@change_settings(
 		"Accounts Settings",
 		{