FRM-40735: WHEN-BUTTON-PRESSED raised unhandled exception INVALID_NUMBER

Question

Hi I get the FRM-40735: WHEN-BUTTON-PRESSED raised unhandled exception INVALID_NUMBER error message for block that has duplicate records.
It works where the block returns no duplicate records.
I'm guessing the error occurs because more than one duplicate records exists. How can I handle this?
Below is the function that I'm using to check for duplicate values:
FUNCTION find_dup (card_in IN varchar2)
RETURN BOOLEAN IS
get_card number;
BEGIN
select card_no into get_card from strike.member where
prop_no = :member.prop_no
and card_no in (select card_no from strike.member
where prop_no = :member.prop_no
having count(*) >1 group by card_no);
RETURN TRUE;
end if;
EXCEPTION
WHEN NO_DATA_FOUND
THEN
RETURN FALSE;
END;
Below is the trigger used where a check is made for duplicate records before proceeding.
WHEN-BUTTON-PRESSED trigger has below:
if find_dup(:member.card_no) then -- guessing it finds more than one card_no value. Help how can I handle this?
go_block('dup_member');
execute_query;
:global.dup_delete := 'Y';
go_item('dup_member.prop_no');
else
message(' No Duplicate Records To View!');
bell;
go_block('member');
hide_view('dup_canvas');
raise form_trigger_failure;
end if;
Edited by: user648524 on Oct 27, 2008 1:33 PM

Answer 1

It looks to me like strike.member.card_no may not actually be a number, and you are trying to select it into get_card.
Try changing your get_card definition to:
get_card    strike.member.card_no%type;