NF:- Credit Pool General Information :- Apply Premium Rounding Rules field not displaying validation message if kept empty

Steps:-
1] Log into the system with valid credentials on AZURE site
2] Search and select QA Test1 company.
3] Click on Manage Credit Pool option from Benadmin curtain
4] Now edit any credit pool from grid
5] Do not select any option for Apply premium rounding rules field and click on Update button

Actual Result:-
No validation message is being displayed for this field if kept empty

Expected Result:-
Validation message should be displayed for this field if kept empty and updated.