在 sap的使用中，存在多個多個開發(fā)團隊為不同 client進行開發(fā)維護，為了避免增強的影響，我們可以如下框架去編寫增強

1)參照MV45AFZA創(chuàng)建一個程序為Y+XXXX+XX_MV45AFZA
XXXX=〉公司代碼
XX=〉Modlue abbreviation

2) add Y+XXXX+XX before all form names to avoid form name conflict
For example
*---------------------------------------------------------------------*
*?????? FORM USEREXIT_MOVE_FIELD_TO_KOMKD???????????????????????????? *
*---------------------------------------------------------------------*
*?????? This userexit can be used to move some fields into the??????? *
*?????? communication workarea for product substitution.????????????? *
*???????????????????????????????????????????????????????????????????? *
*?????? This form is called from form KOMKD_KOMPD_FUELLEN.??????????? *
*???????????????????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
FORM USEREXIT_MOVE_FIELD_TO_KOMKD.
*? KOMKD-zzfield = xxxx-zzfield2.
ENDFORM.

*---------------------------------------------------------------------*
*?????? FORM USEREXIT_MOVE_FIELD_TO_KOMKG???????????????????????????? *
*---------------------------------------------------------------------*
*?????? This userexit can be used to move some fields into the??????? *
*?????? communication workarea for product listing or exclusion.????? *
*???????????????????????????????????????????????????????????????????? *
*?????? This form is called from form KOMKG_KOMPG_FUELLEN.??????????? *
*???????????????????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
form y0029sd_move_field_to_komkg.
*? KOMKG-zzfield = xxxx-zzfield2.
endform.

3)add include statement into MV45AFZA
include y0000sd_mv45afza.? "?
include y0077sd_mv45afza.? "
include y0076sd_mv45afza.? "
include y0029sd_mv45afza.? "?
include y0031sd_mv45afza.? "?
*}?? INSERT*
************************************************************************
*????????????????????????????????????????????????????????????????????? *
* This include is reserved for user modifications????????????????????? *
*????????????????????????????????????????????????????????????????????? *
* Forms for sales document processing????????????????????????????????? *
*????????????????????????????????????????????????????????????????????? *
* The name of modification modules should begin with 'ZZ'.???????????? *
*????????????????????????????????????????????????????????????????????? *
************************************************************************

*---------------------------------------------------------------------*
*?????? FORM USEREXIT_MOVE_FIELD_TO_KOMKD???????????????????????????? *
*---------------------------------------------------------------------*
*?????? This userexit can be used to move some fields into the??????? *
*?????? communication workarea for product substitution.????????????? *
*???????????????????????????????????????????????????????????????????? *
*?????? This form is called from form KOMKD_KOMPD_FUELLEN.??????????? *
*???????????????????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
FORM USEREXIT_MOVE_FIELD_TO_KOMKD.

*? KOMKD-zzfield = xxxx-zzfield2.
ENDFORM.

4) add code depent company or client into? Y+XXXX+XX_MV45AFZA
*---------------------------------------------------------------------*
*?????? FORM USEREXIT_MOVE_FIELD_TO_KOMKD???????????????????????????? *
*---------------------------------------------------------------------*
*?????? This userexit can be used to move some fields into the??????? *
*?????? communication workarea for product substitution.????????????? *
*???????????????????????????????????????????????????????????????????? *
*?????? This form is called from form KOMKD_KOMPD_FUELLEN.??????????? *
*???????????????????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
form y0029sd_move_field_to_komkd.
? perform xvbpa_lesen(sapfv45k) using 'ZH' vbap-posnr sy-tabix.
? move xvbpa-kunnr to komkd-yyheadq.
DATA: BEGIN OF yhpath OCCURS 10.
????????? INCLUDE STRUCTURE vbpavb.
? DATA: END OF yhpath.
? CLEAR:?? yhpath.
? REFRESH: yhpath.
? CALL FUNCTION 'SD_CUSTOMER_HIERARCHY_PATH'
??? EXPORTING
????? customer??????? = vbak-kunnr? "sold-to party
????? date??????????? = sy-datum??? "todays date
????? htype?????????? = 'A'???????? "Customer hierarchy A
????? sales_channel?? = vbak-vtweg? "distr. channel
????? sales_division? = vbak-spart? "division
????? sales_org?????? = vbak-vkorg? "sales org.
??? TABLES
????? hpath?????????? = yhpath
??? EXCEPTIONS
????? hityp_not_exist = 1
????? node_not_exist? = 2
????? parvw_not_exist = 3
????? OTHERS????????? = 4.
? IF sy-subrc = 0.
??? LOOP AT yhpath.
????? CASE sy-tabix.
??????? WHEN 1.
????????? komkd-yy0000sd_hienr01 = yhpath-kunnr.
??????? WHEN 2.
????????? komkd-yy0000sd_hienr02 = yhpath-kunnr.
??????? WHEN 3.
????????? komkd-yy0000sd_hienr03 = yhpath-kunnr.
??????? WHEN 4.
????????? komkd-yy0000sd_hienr04 = yhpath-kunnr.

????? ENDCASE.
??? ENDLOOP.
? ENDIF.
endform.

5) modify MV45AFZA source form code to check whether different company or client enhancement? is active, If it is active, it is will be called
*---------------------------------------------------------------------*
*?????? FORM USEREXIT_MOVE_FIELD_TO_KOMKD???????????????????????????? *
*---------------------------------------------------------------------*
*?????? This userexit can be used to move some fields into the??????? *
*?????? communication workarea for product substitution.????????????? *
*???????????????????????????????????????????????????????????????????? *
*?????? This form is called from form KOMKD_KOMPD_FUELLEN.??????????? *
*???????????????????????????????????????????????????????????????????? *
*---------------------------------------------------------------------*
FORM USEREXIT_MOVE_FIELD_TO_KOMKD.
*? KOMKD-zzfield = xxxx-zzfield2.
*{?? INSERT???????? TASK900030??????????????????????????????????????? 1
*{?? INSERT???????? TE1K900020??????????????????????????????????????? 1
*** functionality: determine customer number of partner ZH (headquarter)
data: c_programm like y0000ca_userexit-yprogramm value 'MV45AFZA'.
data: c_funcname like y0000ca_userexit-yfuncname value
? 'USEREXIT_MOVE_FIELD_TO_KOMKD'.
data: w_programm like y0000ca_userexit-yprogramm.
data: w_funcname like y0000ca_userexit-yfuncname.
data: w_active?? like y0000ca_userexit-yactive.
data: w_subrc??? like sy-subrc.
data: w_mandt??? like sy-mandt.
*** check whether the user exit is activated for this client:
call function 'Y_0000CA_CHECK_USEREXIT'
? exporting
??? pi_programm?????? = c_programm
??? pi_funcname?????? = c_funcname
? importing
??? pe_programm?????? = w_programm
??? pe_funcname?????? = w_funcname
??? pe_active???????? = w_active
??? pe_subrc????????? = w_subrc.
*** if userexit is active execute it.
if sy-subrc = 0.
? if ( w_active <> ' ' ) and ( w_subrc = 0 ).
??? w_mandt = sy-mandt. w_mandt+2(1) = '0'.
??? case w_mandt.
????? when '900' .?
??????? perform y0000sd_move_field_to_komkd.
*????? when '400' .
*??????? perform y0077sd_move_field_to_komkd.
?????? when '410' .?
???????? perform y0076sd_move_field_to_komkd.
?????? when '440' .?
???????? perform y0031sd_move_field_to_komkd.
????? when others.
??? endcase.
? endif.
endif.
*}?? INSERT
*}?? INSERT
ENDFORM.
*eject

6) 建立一個自定義表維護哪些增強已經(jīng)激活
?
?

7）建立檢查激活函數(shù)
FUNCTION y_0000ca_check_userexit.
*"----------------------------------------------------------------------
*"*"Local interface:
*"? IMPORTING
*"???? REFERENCE(PI_PROGRAMM) LIKE? Y0000CA_USEREXIT-YPROGRAMM
*"???? REFERENCE(PI_FUNCNAME) LIKE? Y0000CA_USEREXIT-YFUNCNAME
*"? EXPORTING
*"???? REFERENCE(PE_PROGRAMM) LIKE? Y0000CA_USEREXIT-YPROGRAMM
*"???? REFERENCE(PE_FUNCNAME) LIKE? Y0000CA_USEREXIT-YFUNCNAME
*"???? REFERENCE(PE_ACTIVE) LIKE? Y0000CA_USEREXIT-YACTIVE
*"???? REFERENCE(PE_SUBRC) LIKE? SY-SUBRC
*"----------------------------------------------------------------------

? TABLES: y0000ca_userexit.
? DATA:?? w_client?? LIKE y0000ca_userexit-ymandt.
*** first check whether the user exit is active in the current client:
? w_client = sy-mandt.
? SELECT SINGLE * FROM y0000ca_userexit CLIENT SPECIFIED
??? WHERE yprogramm = pi_programm
????? AND yfuncname = pi_funcname
????? AND ymandt??? = w_client.
*** if first check not successful check again with client xx0:
*** this client xx0 should exist in .
? IF sy-subrc NE 0.
??? w_client+2(1) = '0'.
??? SELECT SINGLE * FROM y0000ca_userexit CLIENT SPECIFIED
????? WHERE yprogramm = pi_programm
??????? AND yfuncname = pi_funcname
??????? AND ymandt??? = w_client.
? ENDIF.
*** if something was found return the values else only the return code:
? pe_subrc = sy-subrc.
? IF sy-subrc EQ 0.
??? pe_active = y0000ca_userexit-yactive.
??? pe_programm = y0000ca_userexit-yprogramm_exec.
??? pe_funcname = y0000ca_userexit-yfuncname_exec.
? ELSE.
??? CLEAR: pe_active.
??? CLEAR: pe_programm.
??? CLEAR: pe_funcname.
? ENDIF.
ENDFUNCTION.

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