SAP增强 BADI屏幕增强实例（MIGO增加分页签）
最终效果：以下根据系统实例做的
（需要注意第4步中的UPDATE函数配置）
1、SE11建立数据表，主要是用于存放附加的数据；
MANDT MANDT CLNT 3 0 客户端
MBLNR MBLNR CHAR 10 0 物料凭证编号
MJAHR MJAHR NUMC 4 0 物料凭证年度
ZEILE MBLPO NUMC 4 0 物料凭证中的项目
BADI_ERFMG ERFMG QUAN 13 3 以输入单位计的数量
BADI_ERFME ERFME UNIT 3 0 条目单位
2、建立结构，在屏幕数据交换时使用
3、建立表类型
设置关键字段：
4、SE80建立函数组
注意：ZJIM_BADI_EXAMPLE_UPDATE_DATA
创建屏幕1000，
设计格式，插入附加字段
创建function: ZJIM_BADI_EXAMPLE_GET_DATA
*"----------------------------------------------------------------------
*"*"Local interface:
*" EXPORTING
*" REFERENCE(ES_MIGO_BADI_SCREEN_FIELDS) TYPE
*" ZJIM_BADI_EXAMPLE_SCREEN_FIELD
*"----------------------------------------------------------------------
* Get all data from fields of external screen
* First move all customer-fields
MOVE-CORRESPONDING zjim_badi_exampl TO es_migo_badi_screen_fields.
* Second move all GOITEM-fields (displayed on external screen)
function: ZJIM_BADI_EXAMPLE_PUT_DATA
*"----------------------------------------------------------------------
*"*"Local interface:
*" IMPORTING
*" REFERENCE(IS_MIGO_BADI_SCREEN_FIELDS) TYPE
*" ZJIM_BADI_EXAMPLE_SCREEN_FIELD
*"----------------------------------------------------------------------
* Put all data from fields to external screen
* First fill all customer-fields
MOVE-CORRESPONDING is_migo_badi_screen_fields TO ZJIM_badi_exampl.
* second fill all GOITEM-fields (displayed on external screen)
function: ZJIM_BADI_EXAMPLE_UPDATE_DATA
*"----------------------------------------------------------------------
*"*"Update function module:
*"
*"*"Local interface:
*" TABLES
*" IT_MIGO_BADI_EXAMPLE STRUCTURE ZJIM_BADI_EXAMPL
*"----------------------------------------------------------------------
* Databse update:
INSERT zjim_BADI_EXAMPL FROM TABLE IT_MIGO_BADI_EXAMPLE.
IF sy-subrc <> 0.
MESSAGE a398(00) WITH 'Error update MIGO_BADI_EXAMPL'.
ENDIF.
INCLUDE : LZJIM_BADI001TOP
TABLES : Zjim_badi_exampl.
到这里增强的准备工作就做完了，下面开始创建实现：
5、SE19创建实现
6、创建执行类ZCL_IM_JIM_MIGO_BADI，**ZJIM_MIGO_BADI
SE80 class
SE37 查看函数
以上界面：SE19
双击类
维护类属性
GT_EXTDATA 用于数据交换，类型为ZJIM_TY_T_EXTDATA表类型，
7、**以下方法并维护：
method IF_EX_MB_MIGO_BADI~INIT.
* Regristration of BAdI-Implementation:
* Append class attribute GF_CLASS_ID (='MIGO_BADI_IMPLEMENTATION1') to
* regristration table.
APPEND gf_class_id TO ct_init.
endmethod.
METHOD IF_EX_MB_MIGO_BADI~PBO_DETAIL .
DATA: ls_extdata TYPE zjim_badi_example_screen_field.
* This check is obligatory, otherwise the program flow is incorrect
* (If there would be more than one implementation of BAdI MB_MIGO_BADI,
* only one subscreen would be displayed).
CHECK i_class_id = gf_class_id.
* Show screen only if there is an item
CHECK i_line_id <> 0.
* External subscreen:
* The content of global field G_NO_INPUT (set in method MODE_SET) will
* influence the number of external subsreen:
if g_no_input is initial.
e_cprog = 'SAPLZJIM_BADI001'(006). "程序名为定义的函数组的名称前加“SAPL“。
e_dynnr = '1000'. "External fields: Input
e_heading = 'ZJIM'(004). "显示标签的名称
endif.
* Set G_LINE_ID (= line_id of item displayed on detail-tabstrip)
g_line_id = i_line_id.
* Read data
READ TABLE gt_extdata INTO ls_extdata
WITH TABLE KEY line_id = i_line_id.
* Export data to function group (for display on subscreen)
CALL FUNCTION 'ZJIM_BADI_EXAMPLE_PUT_DATA'
EXPORTING
is_migo_badi_screen_fields = ls_extdata.
ENDMETHOD. "IF_EX_MB_MIGO_BADI~PBO_DETAIL
METHOD IF_EX_MB_MIGO_BADI~PAI_DETAIL .
*-----------------------------------------------------------------------
* Changing parameter E_FORCE_CHANGE can be set to 'X'. In this case
* method LINE_MODIFY is called.
* ATTENTION:
* DO NOT SET parameter E_FORCE_CHANGE = ' '. In this case you might
* overwrite parameter E_FORCE_CHANGE of another BAdI implementation.
*-----------------------------------------------------------------------
DATA: ls_extdata_new TYPE zjim_badi_example_screen_field,
ls_extdata_old TYPE zjim_badi_example_screen_field.
* Only if a line exists
CHECK i_line_id <> 0.
* Get data from external screen
CALL FUNCTION 'ZJIM_BADI_EXAMPLE_GET_DATA'
IMPORTING
es_migo_badi_screen_fields = ls_extdata_new.
* Compare new data with old data
READ TABLE gt_extdata INTO ls_extdata_old
WITH TABLE KEY line_id = i_line_id.
ls_extdata_new-line_id = i_line_id.
IF ls_extdata_old <> ls_extdata_new.
* If there were any changes, it's obligatory to force MIGO to trigger
* method LINE_MODIFY.
e_force_change = 'X'.
ENDIF.
ENDMETHOD. "IF_EX_MB_MIGO_BADI~PAI_DETAIL
METHOD IF_EX_MB_MIGO_BADI~LINE_MODIFY .
DATA: ls_extdata_old TYPE zjim_badi_example_screen_field,
ls_extdata_new TYPE zjim_badi_example_screen_field,
ls_migo_badi_exampl TYPE zjim_badi_exampl,
l_subrc TYPE sy-subrc.
* Get external data from internal table:
READ TABLE gt_extdata INTO ls_extdata_old
WITH TABLE KEY line_id = i_line_id.
l_subrc = sy-subrc.
* Update data in internal table:
IF l_subrc <> 0.
* Line is new: If GOITEM has a reference to a material document,
* the already existing external data can be read.
IF NOT cs_goitem-mblnr IS INITIAL AND NOT cs_goitem-mjahr IS INITIAL
AND NOT cs_goitem-zeile IS INITIAL.
SELECT SINGLE * FROM zjim_badi_exampl INTO ls_migo_badi_exampl
WHERE mblnr = cs_goitem-mblnr
AND mjahr = cs_goitem-mjahr
AND zeile = cs_goitem-zeile.
IF sy-subrc = 0.
MOVE-CORRESPONDING ls_migo_badi_exampl TO ls_extdata_new.
ENDIF.
ENDIF.
* ls_extdata_new-sgtxt = cs_goitem-sgtxt.
ls_extdata_new-line_id = i_line_id.
INSERT ls_extdata_new INTO TABLE gt_extdata.
ELSE.
* Line exists: Get external data entered on BAdI-subscreeen, but only
* if line_modify was called for the item displayed in the
* 'detail tabstrip'.
check g_line_id = i_line_id.
CALL FUNCTION 'ZJIM_BADI_EXAMPLE_GET_DATA'
IMPORTING
es_migo_badi_screen_fields = ls_extdata_new.
ls_extdata_new-line_id = i_line_id.
* if ls_extdata_new-sgtxt <> ls_extdata_old-sgtxt.
** Field was changed on external screen
* cs_goitem-sgtxt = ls_extdata_new-sgtxt.
* else.
** Take data from GOITEM
* ls_extdata_new-sgtxt = cs_goitem-sgtxt.
* endif.
MODIFY TABLE gt_extdata FROM ls_extdata_new.
ENDIF.
ENDMETHOD. "IF_EX_MB_MIGO_BADI~LINE_MODIFY
METHOD IF_EX_MB_MIGO_BADI~LINE_DELETE .
DELETE TABLE gt_extdata WITH TABLE KEY line_id = i_line_id.
ENDMETHOD. "IF_EX_MB_MIGO_BADI~LINE_DELETE
METHOD IF_EX_MB_MIGO_BADI~POST_DOCUMENT .
DATA: ls_migo_badi_example TYPE ZJIM_badi_exampl,
lt_migo_badi_example TYPE TABLE OF zjim_badi_exampl,
ls_extdata TYPE zjim_badi_example_screen_field,
ls_xmseg TYPE mseg.
FIELD-SYMBOLS: <gt_extdata> TYPE migo_badi_example_screen_field.
* Transaction MIGO will now post a material document.
* Any errors here MUST be issued as A-message (better: X-message)
* Copy data from material document into internal table
LOOP AT gt_extdata INTO ls_extdata.
IF g_cancel IS INITIAL.
READ TABLE it_mseg INTO ls_xmseg
WITH KEY line_id = ls_extdata-line_id.
ELSE.
READ TABLE it_mseg INTO ls_xmseg
WITH KEY smbln = ls_extdata-mblnr
smblp = ls_extdata-zeile
sjahr = ls_extdata-mjahr.
ENDIF.
IF sy-subrc IS INITIAL.
MOVE-CORRESPONDING ls_extdata TO ls_migo_badi_example.
MOVE-CORRESPONDING ls_xmseg TO ls_migo_badi_example.
APPEND ls_migo_badi_example TO lt_migo_badi_example.
ENDIF.
ENDLOOP.
* The data from external detail screen can be saved now:
CHECK gt_extdata IS NOT INITIAL.
CALL FUNCTION 'ZJIM_BADI_EXAMPLE_UPDATE_DATA' IN UPDATE TASK
TABLES
it_migo_badi_example = lt_migo_badi_example.
* The data from external header screen can be saved now:
* MOVE-CORRESPONDING is_mkpf TO gs_exdata_header.
* CALL FUNCTION 'MIGO_BADI_EXAMPLE_UPDATE_HEAD' IN UPDATE TASK
* EXPORTING
* is_migo_badi_header_fields = gs_exdata_header.
ENDMETHOD. "IF_EX_MB_MIGO_BADI~POST_DOCUMENT
METHOD IF_EX_MB_MIGO_BADI~RESET .
* Clear all internal data:
CLEAR: gt_extdata,
g_no_input,
gs_exdata_header,
g_cancel,
g_line_id.
ENDMETHOD. "IF_EX_MB_MIGO_BADI~RESET
**所有，运行T_code MIGO 就可以看到第一个图的效果了。