Required Field Validate on Edit PR

Hello,

I have the following in my State field

    on-change "State[type]==\"feedback\"" {
         require  { "Custom_Text" }
    }

How does Gnatsweb verify that the Custom_Text field is filled in when 
the PR is modified? I'm unable to get the validation to work. In other 
words, when I change the State to feedback, Gnatsweb does not check to 
see if Custom_Text is filled in before the PR is submitted. Thank-you 
for your help.

Thanks,

Ray Tran
Broadcom Corporation