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oracle forms question

anumoses asked
Last Modified: 2012-06-27
Have this code

select count(*) into v_count
  from day_off_sched
  where schedule_code = :day_off_sched.schedule_code;
If v_count > 0 then
msgbox.show('Schedule Error ', 'The Schedule you entered already exixts.', 'OK');
       :day_off_sched.schedule_code := null;
          raise form_trigger_failure;      

End if;
I want this code to fire only on inserting record . not when we query records .
I have this code on key-enter of the schedule code.
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