diff --git a/erpnext/selling/doctype/sales_order/test_sales_order.py b/erpnext/selling/doctype/sales_order/test_sales_order.py
index b30bc03..ff25a3a 100644
--- a/erpnext/selling/doctype/sales_order/test_sales_order.py
+++ b/erpnext/selling/doctype/sales_order/test_sales_order.py
@@ -1305,6 +1305,21 @@
 		so.load_from_db()
 		self.assertRaises(frappe.LinkExistsError, so.cancel)
 
+	def test_so_cancellation_after_maintenance_schedule_submission(self):
+		"""
+			Expected result: Sales Order should not get cancelled
+		"""
+		from erpnext.maintenance.doctype.maintenance_schedule.test_maintenance_schedule import make_maintenance_schedule
+
+		so = make_sales_order()
+		so.submit()
+		ms = make_maintenance_schedule()
+		ms.items[0].sales_order = so.name
+		ms.submit()
+
+		so.load_from_db()
+		self.assertRaises(frappe.LinkExistsError, so.cancel)
+
 	def test_payment_terms_are_fetched_when_creating_sales_invoice(self):
 		from erpnext.accounts.doctype.payment_entry.test_payment_entry import (
 			create_payment_terms_template,