会计凭证的创建

详细看这个：
http://note.youdao.com/share/?id=d626d08f8e6923074d43ed8e1b36ffbe&type=note

http://blog.csdn.net/feijibin/article/details/13279077
其中 最后的代码例子需要更改一下，
代码例子为：

  method IF_EX_ACC_DOCUMENT~CHANGE. DATA: wa_extension   TYPE bapiparex,
        ext_value(960) TYPE c,
        wa_accit       TYPE accit,
        l_ref          TYPE REF TO data.

  FIELD-SYMBOLS: <l_struc> TYPE ANY,
                 <l_field> TYPE ANY.

  SORT c_extension2 BY structure.

  LOOP AT c_extension2 INTO wa_extension.
    AT NEW structure.
      CREATE DATA l_ref TYPE (wa_extension-structure).
      ASSIGN l_ref->* TO <l_struc>.
    ENDAT.
    CONCATENATE wa_extension-valuepart1 wa_extension-valuepart2
                wa_extension-valuepart3 wa_extension-valuepart4
           INTO ext_value.
    MOVE ext_value TO <l_struc>.
    ASSIGN COMPONENT 'POSNR' OF STRUCTURE <l_struc> TO <l_field>.
    READ TABLE c_accit WITH KEY posnr = <l_field>
          INTO wa_accit.
    IF sy-subrc IS INITIAL.
      MOVE-CORRESPONDING <l_struc> TO wa_accit.
      MODIFY c_accit FROM wa_accit INDEX sy-tabix.
    ENDIF.
  ENDLOOP.
  endmethod.

然后就是在程序中添加代码：
程序中的代码为：

DATA:lv_budat LIKE bkpf-budat.
DATA:lv_tabix LIKE sy-tabix.
DATA:LV_STRLEN TYPE char02.
DATA:wa_exten LIKE zextension.
DATA:lv_belnr LIKE bkpf-belnr.
DATA:lv_message TYPE string.
DATA:BEGIN OF lt_zzrcb OCCURS 0,
  number TYPE c,
  zzrcb LIKE zco010-zzrcb,
  END OF lt_zzrcb.
DATA:lw_documentheader LIKE bapiache09,
     lw_accountgl LIKE bapiacgl09,
     lt_accountgl LIKE TABLE OF bapiacgl09,
     lw_currencyamount LIKE bapiaccr09,
     lt_currencyamount LIKE TABLE OF bapiaccr09,
     lt_extension2 LIKE TABLE OF bapiparex WITH HEADER LINE,
     lt_return LIKE TABLE OF bapiret2 WITH HEADER LINE.
CLEAR: lv_budat,lw_documentheader,lw_accountgl,lw_currencyamount,lv_tabix.
REFRESH:lt_accountgl,lt_currencyamount,lt_extension2,lt_return,lt_zzrcb.

CONCATENATE p_gjahr p_monat INTO lv_budat.
 CONDENSE lv_budat NO-GAPS.
CALL FUNCTION 'LAST_DAY_OF_MONTHS'
  EXPORTING
    day_in                  = lv_budat
 IMPORTING
   last_day_of_month       = lw_documentheader-doc_date
 EXCEPTIONS
   day_in_no_date          = 1
   OTHERS                  = 2.
 lw_documentheader-pstng_date = lw_documentheader-doc_date.
 lw_documentheader-comp_code = p_bukrs.
 lw_documentheader-username = sy-uname.
 lw_documentheader-fisc_year = p_gjahr.
 lw_documentheader-fis_period = p_monat.
 lw_documentheader-doc_type = 'SA'.

LOOP AT gt_display INTO gw_display.
lv_strlen = strlen( gw_display-zkwbm ).
IF lv_strlen = '10'.
  lv_tabix = lv_tabix + 1.
lw_accountgl-itemno_acc = lv_tabix.
lw_accountgl-gl_account = gw_display-zkwbm.
lw_accountgl-comp_code = p_bukrs.
lw_accountgl-plant = p_werks.
lw_accountgl-fis_period = p_monat.
lw_accountgl-fisc_year = p_gjahr.
lw_accountgl-orderid = p_aufnr.
APPEND lw_accountgl TO lt_accountgl.
CLEAR lw_accountgl.

lw_currencyamount-itemno_acc = lv_tabix.
lw_currencyamount-amt_doccur = gw_display-zzrcb.
lw_currencyamount-currency   = 'CNY'.
APPEND lw_currencyamount TO lt_currencyamount.
CLEAR lw_currencyamount.

wa_exten-posnr = lv_tabix.
wa_exten-bschl = '40'.
lt_extension2-structure = 'ZEXTENSION'.
lt_extension2-valuepart1 = wa_exten.
APPEND lt_extension2.CLEAR lt_extension2.

lt_zzrcb-number = '1'.
lt_zzrcb-zzrcb = gw_display-zzrcb.
COLLECT lt_zzrcb.CLEAR lt_zzrcb.
ENDIF.
ENDLOOP.
lv_tabix = lv_tabix + 1.

lw_accountgl-itemno_acc = lv_tabix.
lw_accountgl-gl_account = '0099999906'.
lw_accountgl-comp_code = p_bukrs.
lw_accountgl-plant = p_werks.
lw_accountgl-fis_period = p_monat.
lw_accountgl-fisc_year = p_gjahr.
APPEND lw_accountgl TO lt_accountgl.
CLEAR lw_accountgl.


READ TABLE lt_zzrcb INDEX 1.
IF sy-subrc = 0.
lw_currencyamount-itemno_acc = lv_tabix.
lw_currencyamount-amt_doccur = 0 - lt_zzrcb-zzrcb.
lw_currencyamount-currency   = 'CNY'.
APPEND lw_currencyamount TO lt_currencyamount.
CLEAR lw_currencyamount.
ENDIF.

wa_exten-posnr = lv_tabix.
wa_exten-bschl = '50'.
lt_extension2-structure = 'ZEXTENSION'.
lt_extension2-valuepart1 = wa_exten.
APPEND lt_extension2.CLEAR lt_extension2.

CALL FUNCTION 'BAPI_ACC_DOCUMENT_POST'
  EXPORTING
    documentheader          = lw_documentheader
*   CUSTOMERCPD             =
*   CONTRACTHEADER          =
* IMPORTING
*   OBJ_TYPE                =
*   OBJ_KEY                 =
*   OBJ_SYS                 =
  TABLES
   accountgl               = lt_accountgl
*   ACCOUNTRECEIVABLE       =
*   ACCOUNTPAYABLE          =
*   ACCOUNTTAX              =
    currencyamount          = lt_currencyamount
*   CRITERIA                =
*   VALUEFIELD              =
*   EXTENSION1              =
    return                  = lt_return
*   PAYMENTCARD             =
*   CONTRACTITEM            =
   extension2              = lt_extension2.
*   REALESTATE              =
*   ACCOUNTWT               =
COMMIT WORK.
IF sy-subrc = 0.
   READ TABLE lt_return INDEX 1.
   IF lt_return-type = 'S'.
   lv_belnr = lt_return-message_v2+0(10).
   CONCATENATE lv_belnr '创建成功！'  INTO lv_message.
   MESSAGE lv_message TYPE 'S'.
   ELSE.
     MESSAGE lt_return-message TYPE 'E'.
   ENDIF.
   ELSE.
     MESSAGE lt_return-message TYPE 'E'.
ENDIF. 

其中ZEXTENSION还需要在SE11中定义，就是一个简单的结构posnr是必须有的，他是会计凭证行项目编号，另一个就是自己的需要添加的字段。