POPUP_TO_CONFIRM Messages in sap abap programming

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Some time required to take user action so we put the error messages as per the below

DATA: zz_answer TYPE c.
            CALL FUNCTION 'POPUP_TO_CONFIRM'
              EXPORTING
                titlebar              = 'Warning Message'
                text_question         = 'Messages to popup to cofirm'
                text_button_1         = 'Yes'
                text_button_2         = 'No'
                default_button        = '2'
                display_cancel_button = ''
              IMPORTING
                answer                = zz_answer
              EXCEPTIONS
                text_not_found        = 1
                OTHERS                = 2.
            CASE zz_answer.
              WHEN '1'.
*              Process further checks
              WHEN '2'.
                SET SCREEN 0.
                LEAVE TO  SCREEN 4001.

              WHEN OTHERS.
            ENDCASE.

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