SELECTION-SCREEN 編譯失敗

Question

以下 ABAP 代碼塊有什么問題？ 該程序的編譯確實會導致錯誤，但未顯示任何詳細信息。 請建議更改代碼以使其正常工作

REPORT  ZSELECTIONSCREENCOMMENTS.
SELECTION-SCREEN BEGIN OF BLOCK B1 WITH FRAME TITLE TIT1.
SELECTION-SCREEN BEGIN OF LINE.
SELECTION-SCREEN POSITION 20.
PARAMETERS: P_MATNR LIKE MARA-MATNR, P_ERSDA LIKE MARA-ERSDA, P_ERNAM LIKE MARA-ERNAM.
SELECTION-SCREEN COMMENT 1(12) COM1 FOR FIELD P_MATNR.
SELECTION-SCREEN COMMENT 1(12) COM2 FOR FIELD P_ERSDA.
SELECTION-SCREEN COMMENT 1(12) COM3 FOR FIELD P_ERNAM.
SELECTION-SCREEN END OF LINE.
SELECTION-SCREEN END OF BLOCK B1.
LOAD-OF-PROGRAM.
TIT1 = 'Selection-Criteria'.
COM1 = 'Material No'.
COM2 = 'ERSDA'.
COM3 = 'ERNAM'.

Answer 1

您試圖將多個注釋放在一行中的同一位置（ BEGIN OF LINE ... END OF LINE塊），並且您正在向該單行添加多個參數而不指定位置。