1、建立自定義函數
FUNCTION CONVERSION_EXIT_Z0002_OUTPUT.
*"----------------------------------------------------------------------
*"*"Local interface:
*"? IMPORTING
*"???? REFERENCE(INPUT)
*"? EXPORTING
*"???? REFERENCE(OUTPUT)
*"----------------------------------------------------------------------
? DATA: OUTPUT1(12)?? TYPE C,
??????? OUTDATUM?? TYPE INT4.
? IF INPUT <> SPACE.
??? OUTDATUM = INPUT.
??? if input > 0.
????? move OUTDATUM TO OUTPUT .
??? else.
????? OUTDATUM = OUTDATUM * ( -1 ).
????? move OUTDATUM TO OUTPUT1 .
????? CONCATENATE '-' output1 into output.
????? CONDENSE output NO-GAPS .
??? endif.
? ELSE.
??? OUTPUT = SPACE.
? ENDIF.
ENDFUNCTION.?

2、設置ALV輸出格式字段格式
? clear ls_fcat.
? ls_fcat-fieldname = 'INT4'.
? ls_fcat-inttype?? = 'I'.
? ls_fcat-intlen??? = 10.
? ls_fcat-col_pos?? = l_lin.
? ls_fcat-seltext_s = ls_fcat-fieldname.
? ls_fcat-seltext_m = ls_fcat-fieldname.
? ls_fcat-seltext_l = ls_fcat-fieldname.
? ls_fcat-edit_mask = '==Z0002'.
? append ls_fcat to ct_fcat.

3、調用函數就可達到負數符號前顯的效果。
? call function 'REUSE_ALV_GRID_DISPLAY'
??? exporting
????? it_fieldcat?????????????????????? = lt_fcat
??? tables
????? t_outtab????????????????????????? = gt_outtab
??? exceptions
????? program_error???????????????????? = 1
????? others??????????????????????????? = 2.

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