在現實的銷售活動中考慮到配送成本，需要限制小額訂單的開具，為了達到該目的，我們可以對出口USEREXIT_SAVE_DOCUMENT_PREPARE進行增強，具體步驟如下.

一、設計訂單起定量設置表，自定義（銷售公司＋訂單類型）具體定義參見下圖

建立通過sap表維護工具來維護自定義表程序和事務媽。請參考：http://blog.csdn.net/CompassButton/archive/2007/06/04/1637580.aspx

二、設計訂單起定量設置(客戶)表，自定義（客戶)具體定義參見下圖

建立通過sap表維護工具來維護自定義表程序和事務媽。

三、增強代碼

se38打開單元MV45AFZZ，修改USEREXIT_SAVE_DOCUMENT_PREPARE過程，代碼如下

*---------------------------------------------------------------------*
* FORM USEREXIT_SAVE_DOCUMENT_PREPARE *
*---------------------------------------------------------------------*
* This userexit can be used for changes or checks, before a *
* document is saved. *
* *
* If field T180-TRTYP contents 'H', the document will be *
* created, else it will be changed. *
* *
* This form is called at the beginning of form BELEG_SICHERN *
* *
*---------------------------------------------------------------------*
FORM USEREXIT_SAVE_DOCUMENT_PREPARE.
*{ INSERT DEVK938281 1
DATA: zzamount LIKE vbak-netwr.
DATA: zmin LIKE vbak-netwr.
IF vbak-waerk NE tvko-waers. "
CALL FUNCTION 'CONVERT_TO_LOCAL_CURRENCY'
EXPORTING
date = sy-datum
foreign_amount = vbak-netwr
foreign_currency = vbak-waerk
local_currency = sy-waers
IMPORTING
local_amount = zzamount
EXCEPTIONS
no_rate_found = 01
overflow + 02.
IF sy-subrc NE 0.
zzamount = vbak-netwr.
ENDIF.
ELSE.
zzamount = vbak-netwr.
ENDIF.
*minimum order value check in local currency
TABLES: zorderlimit, zorder_limit.
DATA minvalue LIKE vbak-netwr.
DATA difference LIKE vbak-netwr.
SELECT SINGLE * FROM zorder_limit
WHERE vkorg EQ vbak-vkorg
and auart EQ vbak-auart.
IF sy-subrc EQ 0.
SELECT SINGLE * FROM zorderlimit
WHERE KUNNR EQ vbak-KUNNR.
IF sy-subrc EQ 0.
zmin = zorderlimit-ZZNETWR * 100.
IF zzamount < zmin.
MESSAGE '單據小于公司規定的訂單起定量，系統不能保存！' TYPE 'E'.
sy-subrc = 4.
exit.
ENDIF.
ELSE.
zmin = zorder_limit-ZZNETWR * 100.
IF zzamount < zmin.
MESSAGE '單據小于公司規定的訂單起定量，系統不能保存！' TYPE 'E'.
sy-subrc = 4.
exit.
ENDIF.
ENDIF.
ENDIF.
*
*} INSERT

ENDFORM.
*eject

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