When you want to popup message to confirm action, you can apply function module "POPUP_TO_CONFIRM_WITH_MESSAGE". The function will return:

• ’A’ - Yes
• Others - No or Cancel

Example

CALL FUNCTION ’POPUP_TO_CONFIRM_WITH_MESSAGE’
  EXPORTING
    DIAGNOSETTEXT1    =    ’Do you want save data?’
    TEXTLINE1         =    ’ ’
    TITEL             =    ’Confirm message!’
  IMPORTING
    ANSWER            =    lv_answer.