When button pressed, update

Question

I have a criteria as
I created a button 'cancel' with 'when_button_pressed' trigger. IF i press the button cancel , then the table should be updated setting the cancelled_flag column to 'YES' Which is initially by default as 'NO'.
But when i press the button the present row is updating at the same time there is another row created.
This cancellation is dependent on the list item called 'Booking Type'.
IF booking type is General then the cancelled_flag corresponding to the general booking should be updated or else
if the booking type is franchisee then the cancelled_flag corresponding to the franchisee booking should be updated.
But here the cancel button works fine with franchisee booking. but when ever i try to cancel the booking type of general , there is the above mentioned problem.
It is an automatically created form with underlying datablock as general_booking table, and the code is like this
when_button_pressed trigger
BEGIN
     IF :booking_type = 'General' THEN
     UPDATE kspb_regular_booking
          SET cancelled_flag = 'YES',
          amount_refund = :amount_refund,
          cancelled_by = :cancelled_by
          ,cancelled_no = :pass_no
          ,cancelled_on = :cancelled_on
          WHERE pass_no = :pass_no;
          commit;
     ELSIF :booking_type = 'Franchisee' THEN
          UPDATE kspb_franchise_booking
          SET cancelled_flag = 'YES',
          amount_refund = :amount_refund,
          cancelled_by = :cancelled_by
          ,cancelled_no = :pass_no
          ,cancelled_on = :cancelled_on
          WHERE pass_no = :pass_no;
     END IF;
     commit;
END;
The datablock of the form is from the table regular_booking only.
please some one help

Answer 1

But here the cancel button works fine with franchisee booking.
but when ever i try to cancel the booking type of general , there is the above mentioned problem.To wild guess
Maybe you have a block on a kspb_regular_booking table, and you do a data entry on some item of it
Insert an ON_insert trigger on that block
with
begin
NULL;
end;
and try,