用se37创建函数znumc4_initial。
源代码如下：

FUNCTION znumc4_initial.
*"----------------------------------------------------------------------
*"*"本地接口：
*"  IMPORTING
*"     VALUE(TOYEAR) TYPE  INRI-TOYEAR
*"     VALUE(SUBOBJECT) OPTIONAL
*"  TABLES
*"      LT_NRIV STRUCTURE  NRIV OPTIONAL
*"----------------------------------------------------------------------

  DATA: mod      TYPE i ,
        str      TYPE string,
        xstrc    TYPE x,
        xstr     TYPE xstring ,
        days     TYPE i,
        range_nr TYPE inri-nrrangenr.
  DO 366 TIMES.
    CLEAR: str,xstr,xstrc.
    days = sy-index .

    WHILE days > 0 .
      mod = days MOD 26 .
      days = days DIV 26 .
      IF mod = 0.
        mod = 26.
        days = days - 1.
      ENDIF.
      xstrc = mod + 64 .
      CONCATENATE xstrc xstr INTO xstr IN BYTE MODE.
      IF days < 26 AND days > 0 .
        xstrc = days + 64 .
        CONCATENATE xstrc xstr INTO xstr IN BYTE MODE.
        EXIT.
      ENDIF.
    ENDWHILE.

    CALL FUNCTION 'ECATT_CONV_XSTRING_TO_STRING'
      EXPORTING
        im_xstring  = xstr
        im_encoding = '8400'
      IMPORTING
        ex_string   = str.
    range_nr = str.
    IF strlen( range_nr ) = 1.
      range_nr = '0' && range_nr.
    ENDIF.

    lt_nriv-object = 'ZNUM4'.
    lt_nriv-subobject = subobject.
    lt_nriv-nrrangenr = range_nr.
    lt_nriv-toyear = toyear.
    lt_nriv-fromnumber = '0001'.
    lt_nriv-tonumber   = '9999'.
    lt_nriv-nrlevel = 0 .
    APPEND lt_nriv.
  ENDDO.

  MODIFY nriv FROM TABLE lt_nriv.
ENDFUNCTION.

用se37创建函数ZNUMC4_GET_NEXT。
源代码如下：

FUNCTION znumc4_get_next.
*"----------------------------------------------------------------------
*"*"本地接口：
*"  IMPORTING
*"     VALUE(DATUM) TYPE  SY-DATUM DEFAULT SY-DATUM
*"     VALUE(SUBOBJECT)
*"  EXPORTING
*"     REFERENCE(NUMBER)
*"  EXCEPTIONS
*"      INTERVAL_NOT_FOUND
*"      NUMBER_RANGE_NOT_INTERN
*"      OBJECT_NOT_FOUND
*"      QUANTITY_IS_0
*"      QUANTITY_IS_NOT_1
*"      INTERVAL_OVERFLOW
*"      BUFFER_OVERFLOW
*"      TOYEAR_NOT_FOUND
*"----------------------------------------------------------------------

  DATA: mod      TYPE i ,
        str      TYPE string,
        xstrc    TYPE x,
        xstr     TYPE xstring ,
        days     TYPE i,
        day01    TYPE d,
        range_nr TYPE inri-nrrangenr.

  IF datum IS INITIAL .
    datum = sy-datum.
  ENDIF.

  SELECT SINGLE * FROM nriv
    WHERE object = 'ZNUM4' AND
          subobject = subobject AND
          toyear = datum+0(4) .
  IF sy-subrc <> 0.
    RAISE toyear_not_found.
  ENDIF.

  day01 = datum+0(4) && '0101'.
  days = datum - day01 + 1.

  WHILE days > 0 .
    mod = days MOD 26 .
    days = days DIV 26 .
    IF mod = 0.
      mod = 26.
      days = days - 1.
    ENDIF.
    xstrc = mod + 64 .
    CONCATENATE xstrc xstr INTO xstr IN BYTE MODE.
    IF days < 26 AND days > 0 .
      xstrc = days + 64 .
      CONCATENATE xstrc xstr INTO xstr IN BYTE MODE.
      EXIT.
    ENDIF.
  ENDWHILE.

  CALL FUNCTION 'ECATT_CONV_XSTRING_TO_STRING'
    EXPORTING
      im_xstring  = xstr
      im_encoding = '1106'
    IMPORTING
      ex_string   = str.
  range_nr = str.
  IF strlen( range_nr ) = 1.
    range_nr = '0' && range_nr.
  ENDIF.

  CALL FUNCTION 'NUMBER_GET_NEXT'
    EXPORTING
      nr_range_nr             = range_nr
      object                  = 'ZNUM4'
      subobject               = subobject
      toyear                  = datum+0(4)
    IMPORTING
      number                  = number
    EXCEPTIONS
      interval_not_found      = 1
      number_range_not_intern = 2
      object_not_found        = 3
      quantity_is_0           = 4
      quantity_is_not_1       = 5
      interval_overflow       = 6
      buffer_overflow         = 7
      OTHERS                  = 8.
  CASE sy-subrc.
    WHEN 1.
      RAISE interval_not_found.
    WHEN 2.
      RAISE number_range_not_intern.
    WHEN 3.
      RAISE object_not_found.
    WHEN 4.
      RAISE quantity_is_0.
    WHEN 5.
      RAISE quantity_is_not_1.
    WHEN 6.
      RAISE interval_overflow.
    WHEN 7.
      RAISE buffer_overflow.
    WHEN OTHERS.
  ENDCASE.
ENDFUNCTION.

使用方法：

 DATA: numc(4) TYPE n.
 CALL FUNCTION 'ZNUMC4_GET_NEXT'
          EXPORTING
            subobject = '02'
          IMPORTING
            number    = numc
          EXCEPTIONS
            OTHERS    = 9.