Oracle Forms

I've a validation in WHEN-VALIDATE-RECORD, that check for several criterias. When the criteria fail, I display the error as popup and issue 'raise Form_trigger_failure' so that it will abort the rest of the validation.
However, it doesn't seem to abort and keeping looping displaying the same validation error. I had to kill the program via 'Task Manager'.
Could someone advise what I could do to abort the trigger? Thanks very much.

PS. My system is still on Forms6i running as Client Server.