SAP/ABAP: POPUP_TO_CONFIRM FM

IF SY-SUBRC IS INITIAL.
        CALL FUNCTION 'POPUP_TO_CONFIRM'
          EXPORTING
            TEXT_QUESTION = 'Question??????????'
          IMPORTING
            ANSWER        = lv_ans.
        if lv_ans = '1'.
          PERFORM birsey.
        elseif lv_ans = '2'.
          PERFORM baska_birsey.
        endif.
      ELSE.
        PERFORM other.
      ENDIF.