IF :global.row_set IS NULL THEN
    :global.row_set := :system.trigger_record;
    LOOP
      first_record;
      IF :system.current_record != :global.row_set THEN
        uncheck checkbox;
      END IF;
      EXIT WHEN :system.last_record = TRUE;
      next_record;
    END LOOP;
    go_record(:global.row_set);
    :global.row_set := NULL;
  END IF;