Get back old values into Form Building Application

Question

I have a database trigger that raised an error message when a record is no allowed to change/update. I would like to know how I go back to the old values and reflect these into my application.
I use Oracle Forms Building Version 9.0.2.10.1 (Production) under Window XP system. Below is the database trigger code:
CREATE OR REPLACE TRIGGER "DBDSCHM".AAPT_REVIEWS_BUR
BEFORE UPDATE ON AAPT_REVIEWS
REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW
DECLARE
Aaap_approved          EXCEPTION;
BEGIN
IF (Aapfn_List_Items_Desc(:OLD.AREV_STATUS) = 'APPROVED' AND
:OLD.AREV_CREATED_BY = 'AAPTRF' AND
               :OLD.AREV_MODIFIED_BY = 'AAPTRF') THEN
RAISE Aaap_approved;
END IF;
EXCEPTION
WHEN Aaap_approved     THEN                                                            RAISE_APPLICATION_ERROR(40509,'This Review cannot be modified. '||
     'AAP Approved prior to Conversion');
END aapt_review_bur;
SHOW ERROR

Answer 1

Thanks John, but the proposed of this trigger is to prevent any user to update the records that were loader prior to the Data Loader. That is the reason that this trigger has a condition to compare the old value with the new value. Please, see the syntaxes below:
CREATE OR REPLACE TRIGGER "DBDSCHM".AAPT_REVIEWS_BUR
BEFORE UPDATE ON AAPT_REVIEWS
REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW
/* This trigger prevents to modify any AAP review */
/* that was already approved PRIOR TO THE Conversion.*/
BEGIN
IF (Aapfn_List_Items_Desc(:OLD.AREV_STATUS) = 'APPROVED' AND
(:OLD.AREV_CREATED_BY = 'AAPTRF') AND (:OLD.AREV_MODIFIED_BY = 'AAPTRF')) THEN
RAISE_APPLICATION_ERROR(-20090,'This Review cannot be modified. AAP Approved prior to Conversion');
END IF;
END aapt_review_bur;
What I really want is that when the above trigger fire and the user receive the raise application message meaning that the user could not updated the record. But the wrong value still show on the form and it will keep getting this error until you put back the previous value. What I really want is to be able to raise the application error and to show back any values that were tried to modify.