场景描述：MD04是MRP的运行结果，逻辑复杂，功能比较强大。平时可能会遇到业务人员想要将MD04里面某些字段取出来用ALV展示的需求，比如库存短缺报表等，可以用下面的方式来取MD04里面的数据，这个需求比较简单，有复杂需求可以在此基础上增加逻辑。
下面的例子是一个简单的库存短缺报表，将MD04中的部分字段直接取出来展示：
*&---------------------------------------------------------------------*
*& Report ZMMR034
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*
REPORT ZMMR034.
TYPE-POOLS:SLIS.
TABLES:MARA,SSCRFIELDS,MARC.
*----------------------------------------------------------------------*
* ALV定义
*----------------------------------------------------------------------*
DATA: GW_FIELDCAT TYPE SLIS_FIELDCAT_ALV,
GT_FIELDCAT TYPE SLIS_T_FIELDCAT_ALV,
G_LAYOUT TYPE SLIS_LAYOUT_ALV.
*----------------------------------------------------------------------*
* 内表和工作区定义
*----------------------------------------------------------------------*
TYPES:BEGIN OF TY_ALV,
SEL TYPE CHAR1,
WERKS TYPE MARC-WERKS,
MATNR TYPE MARC-MATNR,
MAKTX TYPE MAKT-MAKTX,
MEINS TYPE MARA-MEINS,
DAT00 TYPE MDEZ-DAT00,
DELB0 TYPE MDEZ-DELB0,
EXTRA TYPE MDEZ-EXTRA,
UMDAT TYPE MDEZ-UMDAT,
AUSKT TYPE MDEZ-AUSKT,
MNG01 TYPE MDEZ-MNG01,
MNG02 TYPE MDEZ-MNG02,
END OF TY_ALV.
DATA:GT_ALV TYPE TABLE OF TY_ALV,
WA_ALV TYPE TY_ALV,
GT_OUT TYPE TABLE OF TY_ALV,
WA_OUT TYPE TY_ALV,
LT_HEADINFO TYPE TABLE OF MT61D,
LS_HEADINFO LIKE LINE OF LT_HEADINFO,
LT_INNERINFO TYPE TABLE OF MDEZ,
LS_INNERINFO LIKE LINE OF LT_INNERINFO.
*----------------------------------------------------------------------*
* 选择屏幕
*----------------------------------------------------------------------*
SELECTION-SCREEN BEGIN OF BLOCK B1 WITH FRAME TITLE TEXT-001.
SELECT-OPTIONS:
"PARAMETERS:
S_MATNR FOR MARA-MATNR, "物料号
S_WERKS FOR MARC-WERKS OBLIGATORY DEFAULT '8200'. "工厂
SELECTION-SCREEN END OF BLOCK B1.
*----------------------------------------------------------------------*
* Initialization
*----------------------------------------------------------------------*
INITIALIZATION.
*----------------------------------------------------------------------*
* at selection screen
*----------------------------------------------------------------------*
AT SELECTION-SCREEN OUTPUT.
AT SELECTION-SCREEN.
*----------------------------------------------------------------------*
* Event top of page
*----------------------------------------------------------------------*
TOP-OF-PAGE.
*----------------------------------------------------------------------*
* event Start of Selection
*----------------------------------------------------------------------*
START-OF-SELECTION.
PERFORM FRM_GET_DATA.
PERFORM FRM_LAYOUT_BUILD.
PERFORM FRM_FIELD_BUILD.
PERFORM FRM_DATA_OUT.
*----------------------------------------------------------------------*
*EVENT End-of selection
*----------------------------------------------------------------------*
END-OF-SELECTION.
*----------------------------------------------------------------------*
*EVENT End-of page
*----------------------------------------------------------------------*
END-OF-PAGE.
*----------------------------------------------------------------------*
*----------------------------------------------------------------------*
** forms
*----------------------------------------------------------------------*
*&---------------------------------------------------------------------*
*& Form FRM_CHECK_AUTHORITY
*&---------------------------------------------------------------------*
* " 检查权限
*----------------------------------------------------------------------*
FORM FRM_CHECK_AUTHORITY.
ENDFORM. "FRM_CHECK_AUTHORITY
*----------------------------------------------------------------------*
** forms
*----------------------------------------------------------------------*
*&---------------------------------------------------------------------*
*& Form FRM_LAYOUT_BUILD
*&---------------------------------------------------------------------*
* " 设置表格样式
*----------------------------------------------------------------------*
FORM FRM_LAYOUT_BUILD .
G_LAYOUT-BOX_FIELDNAME = 'SEL'. " 选择模式，在最左端有选择按钮
G_LAYOUT-COLWIDTH_OPTIMIZE = 'X'. " 自动调整列宽
G_LAYOUT-ZEBRA = 'X'. " 表格斑马线
"G_LAYOUT-EDIT = 'X'. "可编辑
G_LAYOUT-INFO_FIELDNAME = 'CLR'.
ENDFORM. "FRM_LAYOUT_BUILD
*&---------------------------------------------------------------------*
*& Form FRM_FIELD_BUILD
*&---------------------------------------------------------------------*
* " 建立表头数据
*----------------------------------------------------------------------*
FORM FRM_FIELD_BUILD .
CLEAR GT_FIELDCAT.
PERFORM FIELD_SET:
USING 'WERKS' '工厂' '15' '' ,
USING 'MATNR' '物料编码' '15' 'X' ,
USING 'MAKTX' '物料描述' '15' '' ,
USING 'MEINS' '单位' '15' '' ,
USING 'DAT00' '日期' '15' '' ,
USING 'DELB0' 'MRP元素' '15' '' ,
USING 'EXTRA' 'MRP元素数据' '15' '' ,
USING 'UMDAT' '再计划日期' '15' '' ,
USING 'AUSKT' '例外' '15' '' ,
USING 'MNG01' '收货/需求' '15' '' ,
USING 'MNG02' '可用数量' '15' ''.
ENDFORM. "FRM_FIELD_BUILD
*&---------------------------------------------------------------------*
*& Form FRM_DATA_OUT
*&---------------------------------------------------------------------*
* 输出数据
*----------------------------------------------------------------------*
FORM FRM_DATA_OUT.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
I_CALLBACK_PROGRAM = SY-REPID
IS_LAYOUT = G_LAYOUT
IT_FIELDCAT = GT_FIELDCAT
I_SAVE = 'X'
I_CALLBACK_PF_STATUS_SET = 'FRM_STATE'
I_CALLBACK_USER_COMMAND = 'FRM_USER_COMMAND'
TABLES
T_OUTTAB = GT_OUT
EXCEPTIONS
PROGRAM_ERROR = 1
OTHERS = 2.
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
ENDFORM. "FRM_DATA_OUT
*&---------------------------------------------------------------------*
*& Form FRM_SET_PF_STATUS
*&---------------------------------------------------------------------*
FORM FRM_STATE USING RT_EXTAB TYPE SLIS_T_EXTAB.
SET PF-STATUS 'STANDARD'.
ENDFORM. "FRM_STATE
*&---------------------------------------------------------------------*
*& Form FRM_USER_COMMAND
*&---------------------------------------------------------------------*
FORM FRM_USER_COMMAND USING R_UCOMM LIKE SY-UCOMM
RS_SELFIELD TYPE SLIS_SELFIELD.
READ TABLE GT_ALV INTO WA_ALV INDEX RS_SELFIELD-TABINDEX.
CHECK SY-SUBRC = 0.
ENDFORM. "FRM_USER_COMMAND
*&---------------------------------------------------------------------*
*& Form FIELD_SET
*&---------------------------------------------------------------------*
FORM FIELD_SET USING P_FIELDNAME
P_SELTEXT_L
P_OUTPUTLEN
P_HOTSPOT.
GW_FIELDCAT-FIELDNAME = P_FIELDNAME .
GW_FIELDCAT-SELTEXT_L = P_SELTEXT_L .
GW_FIELDCAT-OUTPUTLEN = P_OUTPUTLEN .
GW_FIELDCAT-HOTSPOT = P_HOTSPOT.
APPEND GW_FIELDCAT TO GT_FIELDCAT.
CLEAR GW_FIELDCAT.
ENDFORM. "FIELD_SET
*&---------------------------------------------------------------------*
*& Form FRM_GET_DATA
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
* --> p1 text
* <-- p2 text
*----------------------------------------------------------------------*
FORM FRM_GET_DATA .
SELECT MATNR WERKS
INTO CORRESPONDING FIELDS OF TABLE GT_ALV
FROM MARC
WHERE MATNR IN S_MATNR AND WERKS IN S_WERKS.
IF GT_ALV IS INITIAL.
MESSAGE '没有找到满足条件的数据' TYPE 'E'.
ENDIF.
LOOP AT GT_ALV INTO WA_ALV.
CALL FUNCTION 'MD_STOCK_REQUIREMENTS_LIST_API'
EXPORTING
MATNR = WA_ALV-MATNR
WERKS = WA_ALV-WERKS
IMPORTING
E_MT61D = LS_HEADINFO
TABLES
MDEZX = LT_INNERINFO
EXCEPTIONS
MATERIAL_PLANT_NOT_FOUND = 1
PLANT_NOT_FOUND = 2
OTHERS = 3.
LOOP AT LT_INNERINFO INTO LS_INNERINFO.
WA_OUT-WERKS = WA_ALV-WERKS.
WA_OUT-MATNR = WA_ALV-MATNR.
WA_OUT-MAKTX = LS_HEADINFO-MAKTX.
WA_OUT-MEINS = LS_HEADINFO-MEINS.
WA_OUT-DAT00 = LS_INNERINFO-DAT00.
WA_OUT-DELB0 = LS_INNERINFO-DELB0.
WA_OUT-EXTRA = LS_INNERINFO-EXTRA.
WA_OUT-UMDAT = LS_INNERINFO-UMDAT.
WA_OUT-AUSKT = LS_INNERINFO-AUSKT.
WA_OUT-MNG01 = LS_INNERINFO-MNG01.
WA_OUT-MNG02 = LS_INNERINFO-MNG02.
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
EXPORTING
INPUT = WA_OUT-MATNR
IMPORTING
OUTPUT = WA_OUT-MATNR.
APPEND WA_OUT TO GT_OUT.
CLEAR:WA_OUT,LS_INNERINFO.
ENDLOOP.
CLEAR:WA_ALV,LS_HEADINFO.
ENDLOOP.
SORT GT_OUT BY WERKS MATNR.
ENDFORM. "FRM_GET_DATA
