如何解决ALV的负数符号前显的问题

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1、建立自定义函数
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、设置ALV输出格式字段格式
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、调用函数就可达到负数符号前显的效果。
call function 'REUSE_ALV_GRID_DISPLAY'
    exporting
      it_fieldcat                       = lt_fcat
    tables
      t_outtab                          = gt_outtab
    exceptions
      program_error                     = 1
      others                            = 2.