In your case the the transition title Reject would be what you are changing. This might not make sense to the users to transition to reasons for rejection. The comment field you could put a translation in that would change it but it would be across all projects so that would not work. You could make comment required and then have a message that states the reason for rejection is required. In order to do that you would need an App like JSU. You could create a custom field with some canned reasons and have them select the reason from a drop down. Those are a few options you could use.
I we tried the mentioned same way ,
1. added comment screen to the transition
2. set comment screen as required and i added error message optional
3. so i added a comment for error message optional field which display in the required section.
so after following all the steps , when i move the transition to done status i can see that comment screen as mandatory field but i was not able to view any error message.
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