How to select only three approvers at same time

Hi all,  I have a Request entity. I have added association between Request entity to Admin entity.  I have used reference selector(showed account names on page ) to display approver names.  Now I only want at same time only three approver should select if more that that select one error message should visible. How can I do this.
1 answers



You can use some widgets which has checkbox to select multiple options, and for error, You can set a condition that approver should be less than or equal to 3 and set up a validation message for error pop-up if more than 3 was selected