RAISE FORM_TRIGGER_FAILURE is not working

Question

I am customizing a medical form with two blocks: cov_med_prem_header and cov_med_prem_lines. When user select emp_group from header, the list of medical program with end_date = '31-DEC-4712' will show at the detail block. Once a year at the open enrollment, HR will end date the previous year's program and enter the same programs but with different premium, also set the end_date = '31-DEC-4712'. In order to prevent user from enter to the wrong record, I added when-validate-record trigger for the detail block:
declare
max_effective_end_date DATE;
begin
select effective_end_date
into max_effective_end_date
from cov.cov_medical_premiums
where emp_group = :cov_med_prem_header.emp_group
and coverage_type = :cov_med_prem_lines.coverage_type
and part_time = :cov_med_prem_lines.part_time
and med_provider = :cov_med_prem_lines.med_provider
and sysdate between effective_start_date and effective_end_date;
if (:system.record_status = 'INSERT') and (max_effective_end_date = '31-DEC-4712') then
MESSAGE ('YOU HAVE ENDTERED THE WRONG RECORD. PLEASE CHECK AND TRY AGAIN!');
RAISE FORM_TRIGGER_FAILURE;
end if;
exception
when others then null;
end;
But the RAISE FORM_TRIGGER_FAILURE is not working because the exception, but if I take out the exception part, I am not able to insert into the form, message like unhandled exception.
Can anyone help with this? Thanks.

Answer 1

Hi,
There should not be an Exception part if you are using Form_Trigger_failure. So first find out what exception you are getting with the code, commenting out the raise form_trigger_failure. And first handle that, and then remove the exception part and use form_trigger _failure