ABAP-负号前置

1.创建一个CONVERSION_EXIT_ZXXX_OUTPUT的函数，ZXXX可自定义

FUNCTION conversion_exit_z001_output.
*"----------------------------------------------------------------------
*"*"本地接口：
*"  IMPORTING
*"     REFERENCE(INPUT)
*"  EXPORTING
*"     REFERENCE(OUTPUT)
*"----------------------------------------------------------------------

  DATA: output1(20),
        output2(20),
        outnum(16) TYPE p DECIMALS 2.
  outnum = input.
  IF input >= 0.
    WRITE outnum TO output1.
  ELSE.
    outnum = outnum * ( -1 ).
    WRITE outnum TO output1.
    CONCATENATE '-' output1 INTO output1.
  ENDIF.

  CONDENSE output1 NO-GAPS.
  WRITE output1 TO output2 RIGHT-JUSTIFIED.
  output = output2.
  CLEAR: output2.

ENDFUNCTION.

2.将Fieldcat的edit_mask字段赋值为’==ZXXX’。ZXXX参考定义的函数名称