在badi中按照正常的message xxx的方式无法把message抛出来，
CALLPOPUP_TO_CONFIRM去解决这个问题，完了测试一看，像那么回事。
且看代码：
METHOD if_ex_invoice_update~change_at_save.
DATA: lv_answer TYPE c.
DATA: lv_text(300) TYPE c.
CONCATENATE text-002 text-003 text-004 INTO lv_text.
CALL FUNCTION 'POPUP_TO_CONFIRM'
EXPORTING
titlebar = text-001 " Error
text_question = lv_text " Message text
text_button_1 = text-005 " Ingore
text_button_2 = text-006 " Handle Error
display_cancel_button = '' " disable this button
popup_type = 'ICON_MESSAGE_ERROR' " error message icon
IMPORTING
answer = lv_answer. " button number
IF lv_answer = 2.
LEAVE TO SCREEN 6000. " return to current screen
ENDIF.
ENDMETHOD.
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