problem med timer i orakelform

prøv dette, det burde virke.

    PROCEDURE Delete_Timer IS
         tm_id  TIMER;
    BEGIN
      tm_id:=Find_Timer('TIMER1');
      IF NOT Id_Null(tm_id) THEN
        Delete_Timer(tm_id);
      ELSE
        Message('Timer '||' has already been cancelled.');
      END IF;
    END;