SAP SD VT01N,VT02N,VT03N 创建运输单屏幕增强

客户要求，在VT02N和VT03N的主屏幕上增强客制化字段，经查阅资料得知，标准的屏幕增强只供SAP内部使用，所以只能换一种方式实现。

最终我的实现方法是，在VT02N，VT03N复制标准GUI增加客制化的按钮，点击按钮跳转到克制化屏幕，具体实现步骤如下：

用户出口：EXIT_SAPMV56A_004    创建INCLUDE : EXIT_SAPMV56A_004

添加代码如下：

DATA: L_TA_CONTROL LIKE LINE OF C_TA_CONTROL.
FIELD-SYMBOLS <CUA> LIKE LINE OF C_CUA_CONTROL.
 
*Set a custom status which includes the button required to navigate
*to the Extra data screen. This status will dynamically be called
*from the program control and is a copy of the standard status of the
*screen 1020
 
IF SY-TCODE = 'VT02N'OR
   SY-TCODE = 'VT03N'.
  READ TABLE C_CUA_CONTROL ASSIGNING <CUA>
  WITH KEY PROGNAME = 'SAPMV56A'
           DYNPRO   = '1020'
           TRTYP    = '*'.
  IF SY-SUBRC = 0.
*这一步就是为下一步调用的GUI_STATUS先创建一个函数组 ，下面是函数组主程序名
    <CUA>-STATPROG = 'SAPLZ_PLES_SHIPMENT'.
*这一步就是修改标准的调用步骤，将标准的GUI_STATUS--->TRA_MAIN 复制成ZTRA_MAIN
    <CUA>-STATUS = 'ZTRA_MAIN'.
  ENDIF.
ENDIF.

第二步，在用户出口：EXIT_SAPMV56A_001 创建  INCLUDE ZXV56U18.

添加如下代码

*Description : User EXIT EXIT_SAPMV56A_001 (ENHANCEMENT V56AFCCH)
*The normal purpose OF this EXIT IS TO CHECK IF a
*particular FUNCTION CODE may be executed (see doc)
*IN this CASE it IS used TO initialise/read extra DATA
*pertaining TO the shipment that IS processed IN a cusom SCREEN.
 
CHECK I_FCODE EQ 'DETAILS'.  "这个就是上一步 你复制出来的GUI_STATUS中新增的按钮名
"这里传入运输单号，进入自建的function 里面调用你想要的展示的屏幕
CALL FUNCTION 'ZSD_SHIPMENT_ENHANCEMENT'
  EXPORTING
    IV_TKNUM  = I_XVTTK_WA-TKNUM
          .