Verified on IE 11, Chrome
Environment - Code Map
Login - Partner

Replication Steps:
1)Login with partner
2)Search and select company "UiRefresh_DC_QA_13554 "
3)Search employee -> employee Settings -> Change Classes
4)Validation messages are not showing when mandatory fields data are not filled and saved

Expected Result : When mandatory fields data are not filled and save then system must show validation message.

Actual Result : Validation message not working for Change classes