Replacing default column constraint violation messages in Forms...

I am trying to move all of my pre-update and pre-insert validation triggers from the 3.0 form level to the database trigger level.

I wrote the following test trigger. It is only a test trigger and will not be used. Problem is, the message that I put in the RAISE_APPLICATION_ERROR does not show up in the form. The trigger does work and halts the insert or update when a date is input greater that 2000, but the error message in the form is "FRM-40508: ORACLE error -- unable to INSERT record." How do I overide this message with my own personal message. Good answers recieve a free cookie..

CREATE OR REPLACE TRIGGER JUNK_DATE
AFTER INSERT OR UPDATE ON JUNK FOR EACH ROW BEGIN
  IF :NEW.DATE2 >= TO_DATE('01-JAN-2000','DD-MON-YYYY') THEN     RAISE_APPLICATION_ERROR(-20100,
    'ERROR: This date is greater than the year 2000');   END IF;
END;
.
/

                     -Mark