需求：在選擇屏幕上ANLN1，ANLN2,BUKRS 這個三個字段要么同時都有輸入，要么都沒有輸入，如果只輸入其中一個，跳出一個message 提醒用戶輸入其余的參數，請看下面的代碼就可以實現該功能了：
TABLES: sscrfields.
AT SELECTION-SCREEN.
? IF sscrfields-ucomm = ‘ ONLI’ OR
? sscrfields-ucomm = ‘ PRIN’ OR
? sscrfields-ucomm = ‘SJOB’.
??? PERFORM validate_input_para.
? ENDIF.
FORM validate_input_para .
*** Validation Rule 1: The full asset number/sub number/company code must
***??????????????????? be provided.? Otherwise the fields should all be
***??????????????????? blank.
? IF NOT ( ( p_anln1 IS INITIAL AND
???????????? p_anln2 IS INITIAL AND
???????????? p_bukrs IS INITIAL???? )???? OR
?????????? ( NOT p_anln1 IS INITIAL AND
???????????? NOT p_anln2 IS INITIAL AND
???????????? NOT p_bukrs IS INITIAL ) ).
*** Issue an error message
*** Additional Code is required to display a message indicating
*** the parameters are not entered properly
??? IF p_anln1 IS INITIAL.
????? MESSAGE i000 WITH ‘Asset Number need to be entered’.
????? LEAVE SCREEN.
??? ELSEIF p_anln2 IS INITIAL.
????? MESSAGE i000 WITH ‘Sub Number need to be entered’.
????? LEAVE SCREEN.
??? ELSEIF p_bukrs IS INITIAL.
????? MESSAGE i000 WITH ‘Company Code need to be entered’.
????? LEAVE SCREEN.
??? ENDIF.
? ENDIF.
ENDFORM.??????????????????? ” VALIDATE_INPUT_PARA

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