@Sandeep RajputI found the issue. Now its working fine.

@Sandeep Rajput I have been looking at this as I have the same requirement. The problem i'm getting is that when I add a user to my custom field, the role is added to the profile. When you then add an additional user after the first user it then gives a unique key violation and removes the role from the user still in the custom field. Any idea why this is? 

@Luke James Could you please post a separate question with screenshot of your business rule and form where you are facing this issue.

Hi Pankaj,

Can you please share the need for such use case.

@Jaspal Singh  Its our client's requirement.