首先，简单说明一下要用到的表类型、类、函数：

表类型
LVC_T_FCAT-（存放自定义列属性的表类型，一般用到的属性有：FIELDNAME、OUTPUTLEN、DATATYPE、INTTYPE、INTLEN、DECIMALS）。
       LVC_S_FCAT- （LVC_T_FCAT类型的工作区类型）。
类
       CL_ABAP_TABLEDESCR-（内表结构属性操作类，比如可以读取内表的列名称、内表值、内表列属性等等）。
CL_ABAP_STRUCTDESCR-（CL_ABAP_TABLEDESCR的工作区类型）。
函数
CONVERSION_EXIT_CUNIT_OUTPUT-（单位输出转换）。
        CL_ABAP_TYPEDESCR=>DESCRIBE_BY_DATA( 内表 )：获取CL_ABAP_TABLEDESCR对象。
        CL_ABAP_TABLEDESCR对象->GET_TABLE_LINE_TYPE( )：获取CL_ABAP_STRUCTDESCR对象（注意函数括号里面的空格）。
        REUSE_ALV_GRID_DISPLAY：ALV显示内表结果。
        REUSE_ALV_COMMENTARY_WRITE：ALV抬头信息。
下面是一个开发实例的SAMPLE，根据给出的BOM循环查找BOM下面的所有最底层物料，根据工厂存在的物料价格动态地输出相应的列：
*&---------------------------------------------------------------------*
*& Report  ZCOR017
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*

REPORT  ZCOR017.
TABLES:MAST,STPO.
TYPE-POOLS: SLIS.

*****************************TYPES*****************************************
TYPES:BEGIN OF TY_STPO,
  STLNR TYPE STPO-STLNR,
  STLTY TYPE STPO-STLTY,
  STLKN TYPE STPO-STLKN,
  STPOZ TYPE STPO-STPOZ,
  IDNRK TYPE STPO-IDNRK,
END OF TY_STPO.

TYPES:BEGIN OF TY_MAST,
  MATNR TYPE MAST-MATNR,
  WERKS TYPE MAST-WERKS,
  STLAN TYPE MAST-STLAN,
  STLNR TYPE MAST-STLNR,
END OF TY_MAST.

TYPES:BEGIN OF TY_MAKT,
  MATNR TYPE MAKT-MATNR,
  MAKTX TYPE MAKT-MAKTX,
END OF TY_MAKT.

TYPES:BEGIN OF TY_MARA,
  MATNR TYPE MARA-MATNR,
  MEINS TYPE MARA-MEINS,
END OF TY_MARA.

TYPES:BEGIN OF TY_T001K,
  BWKEY TYPE T001K-BWKEY,
END OF TY_T001K.

TYPES:BEGIN OF TY_MBEW,
  MATNR TYPE MBEW-MATNR,
  BWKEY TYPE MBEW-BWKEY,
  STPRS TYPE MBEW-STPRS,
  PEINH TYPE MBEW-PEINH,
END OF TY_MBEW.

*****************************DATA*****************************************
DATA:
      GT_STPO TYPE TABLE OF TY_STPO,
      GS_STPO TYPE TY_STPO,
      LT_STPO TYPE TABLE OF TY_STPO,
      LS_STPO TYPE TY_STPO,
      GT_MAST TYPE TABLE OF TY_MAST,
      GS_MAST TYPE TY_MAST,
      LT_MAST TYPE TABLE OF TY_MAST,
      LS_MAST TYPE TY_MAST,
      GT_MAKT TYPE TABLE OF TY_MAKT,
      GS_MAKT TYPE TY_MAKT,
      GT_MARA TYPE TABLE OF TY_MARA,
      GS_MARA TYPE TY_MARA,
      GT_T001K TYPE TABLE OF TY_T001K,
      GS_T001K TYPE TY_T001K,
      GT_MBEW TYPE TABLE OF TY_MBEW,
      GS_MBEW TYPE TY_MBEW,
      DNY_TAB TYPE REF TO DATA,
      DNY_LINE TYPE REF TO DATA,
      IFC     TYPE LVC_T_FCAT,
      XFC     TYPE LVC_S_FCAT,
      GS_LAYOUT TYPE SLIS_LAYOUT_ALV,
      GT_FIELD TYPE SLIS_T_FIELDCAT_ALV,
      GS_FIELD LIKE LINE OF GT_FIELD,
      COUNTER TYPE I VALUE 0,
      GV_STC_DESC TYPE REF TO CL_ABAP_STRUCTDESCR,
      GV_TAB_DESC TYPE REF TO CL_ABAP_TABLEDESCR,
      GT_TOP TYPE SLIS_T_LISTHEADER,
      GS_TOP TYPE SLIS_LISTHEADER.
.

******************************DEFINETION****************************************

DEFINE DF_LVC_FCAT.
  XFC-FIELDNAME = &1.
  XFC-DATATYPE  = &2.
  XFC-INTTYPE   = &3.
  XFC-INTLEN    = &4.
  XFC-DECIMALS  = &5.
  APPEND XFC TO IFC.
  CLEAR XFC.
END-OF-DEFINITION.

DEFINE M_ALV_FIELDCAT.
  GS_FIELD-FIELDNAME     = &1.
  GS_FIELD-REPTEXT_DDIC  = &2.
  GS_FIELD-OUTPUTLEN     = &3.
  GS_FIELD-ICON          = &4.
  GS_FIELD-EDIT          = ''.
  GS_FIELD-CHECKBOX      = ''.
  GS_FIELD-REF_FIELDNAME = ''.
  GS_FIELD-REF_TABNAME   = ''.
  GS_FIELD-JUST          = ''.
  GS_FIELD-NO_ZERO       = ''.
  APPEND GS_FIELD TO GT_FIELD.
  CLEAR GS_FIELD.
END-OF-DEFINITION.

******************************FILED-SYMBOLS****************************************
FIELD-SYMBOLS:
               $DNY_TAB>  TYPE STANDARD TABLE,"该死的渣浪不支持小于号大于号组合，只能用$来代替了。
               $DNY_WA> ,
               $DNY_FIELD>,
               $FS_TAB> TYPE ABAP_COMPDESCR.

******************************SCREEN****************************************
SELECTION-SCREEN BEGIN OF BLOCK B1 WITH FRAME TITLE TEXT-009.
SELECTION-SCREEN BEGIN OF LINE.
SELECTION-SCREEN COMMENT 1(51) TEXT-010.
SELECTION-SCREEN END OF LINE.
SELECTION-SCREEN BEGIN OF LINE.
SELECTION-SCREEN COMMENT 1(50) TEXT-011.
SELECTION-SCREEN END OF LINE.
SELECTION-SCREEN BEGIN OF LINE.
SELECTION-SCREEN COMMENT 1(60) TEXT-012.
SELECTION-SCREEN END OF LINE.
SELECTION-SCREEN END OF BLOCK B1.

SELECTION-SCREEN BEGIN OF BLOCK B2 WITH FRAME TITLE TEXT-001.
SELECT-OPTIONS:
  SMATNR FOR MAST-MATNR OBLIGATORY.
PARAMETERS  SWERKS TYPE MAST-WERKS.
SELECTION-SCREEN BEGIN OF LINE.
SELECTION-SCREEN COMMENT 1(10) TEXT-002 FOR FIELD R1.
PARAMETERS R1 RADIOBUTTON GROUP G1 DEFAULT 'X'.
SELECTION-SCREEN COMMENT 14(10) TEXT-003 FOR FIELD R1.
PARAMETERS R2 RADIOBUTTON GROUP G1.
SELECTION-SCREEN COMMENT 27(10) TEXT-004 FOR FIELD R1.
SELECTION-SCREEN END OF LINE.
PARAMETERS P1 TYPE T416-STLAN OBLIGATORY.
SELECTION-SCREEN END OF BLOCK B2.

*******************************FLOW***************************************
INITIALIZATION.
  "DO NOTHING.

AT SELECTION-SCREEN.
  PERFORM CHECK_INPUT.

START-OF-SELECTION.
  PERFORM RETRIVE_DATA.
  PERFORM PROCESS_DATA.

END-OF-SELECTION.
  PERFORM PROCESS_OUTPUT.


*******************************FORM***************************************
*&---------------------------------------------------------------------*
*&      Form  CHECK_INPUT
*&---------------------------------------------------------------------*
*       text
*----------------------------------------------------------------------*
*  -->  p1        text
*  <--  p2        text
*----------------------------------------------------------------------*
FORM CHECK_INPUT .
  "BOM类别为主机BOM，物料输入为6101*或671*，否则提示“主机BOM只允许输入6101*或671*物料”
  IF R1 = 'X'.
    LOOP AT SMATNR.
      IF SMATNR-LOW IS NOT INITIAL AND SMATNR-HIGH IS INITIAL.
        IF SMATNR-LOW+0(4) NE '6101' AND SMATNR-LOW+0(3) NE '671'.
          MESSAGE TEXT-005 TYPE 'E'.
          LEAVE LIST-PROCESSING.
        ENDIF.
      ELSEIF SMATNR-LOW IS NOT INITIAL AND SMATNR-HIGH IS NOT INITIAL.
        IF SMATNR-LOW+0(4) EQ '6101' AND SMATNR-HIGH+0(4) NE '6101'.
          MESSAGE TEXT-005 TYPE 'E'.
          LEAVE LIST-PROCESSING.
        ENDIF.
        IF SMATNR-LOW+0(4) NE '6101' AND SMATNR-HIGH+0(4) EQ '6101'.
          MESSAGE TEXT-005 TYPE 'E'.
          LEAVE LIST-PROCESSING.
        ENDIF.
        IF SMATNR-LOW+0(3) EQ '671' AND SMATNR-HIGH+0(3) NE '671'.
          MESSAGE TEXT-005 TYPE 'E'.
          LEAVE LIST-PROCESSING.
        ENDIF.
        IF SMATNR-LOW+0(3) NE '671' AND SMATNR-HIGH+0(3) EQ '671'.
          MESSAGE TEXT-005 TYPE 'E'.
          LEAVE LIST-PROCESSING.
        ENDIF.
      ELSE.
        MESSAGE TEXT-005 TYPE 'E'.
        LEAVE LIST-PROCESSING.
      ENDIF.
    ENDLOOP.
    "BOM类别为项目物资，物料输入为672*数据，否则提示“只允许输入672*物料”
  ELSEIF R2 = 'X'.
    LOOP AT SMATNR.
      IF SMATNR-LOW IS NOT INITIAL AND SMATNR-HIGH IS INITIAL.
        IF SMATNR-LOW+0(3) NE '672'.
          MESSAGE TEXT-006 TYPE 'E'.
          LEAVE LIST-PROCESSING.
        ENDIF.
      ELSEIF SMATNR-LOW IS NOT INITIAL AND SMATNR-HIGH IS NOT INITIAL.
        IF SMATNR-LOW+0(3) NE '672' OR SMATNR-HIGH+0(3) NE '672'.
          MESSAGE TEXT-006 TYPE 'E'.
          LEAVE LIST-PROCESSING.
        ENDIF.
      ELSE.
        MESSAGE TEXT-006 TYPE 'E'.
        LEAVE LIST-PROCESSING.
      ENDIF.
    ENDLOOP.
  ENDIF.
ENDFORM.                    " CHECK_INPUT



*&---------------------------------------------------------------------*
*&      Form  RETRIVE_DATA
*&---------------------------------------------------------------------*
*       text
*----------------------------------------------------------------------*
*  -->  p1        text
*  <--  p2        text
*----------------------------------------------------------------------*
FORM RETRIVE_DATA .
  "检查BOM存在性
  IF SWERKS IS NOT INITIAL.
    SELECT MATNR WERKS STLAN STLNR
      FROM MAST
      INTO CORRESPONDING FIELDS OF TABLE GT_MAST
      WHERE MATNR IN SMATNR
        AND WERKS EQ SWERKS
        AND STLAN EQ P1.
  ELSE.
    SELECT MATNR WERKS STLAN STLNR
      FROM MAST
      INTO CORRESPONDING FIELDS OF TABLE GT_MAST
      WHERE MATNR IN SMATNR
        AND STLAN EQ P1.
  ENDIF.

  IF GT_MAST IS INITIAL.
    MESSAGE TEXT-007 TYPE 'I'.
    LEAVE LIST-PROCESSING.
    CALL SELECTION-SCREEN 1000.
  ENDIF.

  "根据BOM获取子层
  SELECT STLNR STLTY STLKN STPOZ IDNRK
    FROM STPO
    INTO CORRESPONDING FIELDS OF TABLE GT_STPO
    FOR ALL ENTRIES IN GT_MAST
    WHERE STLTY EQ 'M'
      AND STLNR = GT_MAST-STLNR.

  PERFORM FOO_BOM CHANGING GT_STPO.

  "删除重复行
  SORT GT_STPO BY IDNRK.
  DELETE ADJACENT DUPLICATES FROM GT_STPO COMPARING IDNRK.

  "获取物料描述
  SELECT MATNR MAKTX FROM MAKT
    INTO CORRESPONDING FIELDS OF TABLE GT_MAKT
    FOR ALL ENTRIES IN GT_STPO
    WHERE MATNR = GT_STPO-IDNRK.

  "获取单位
  SELECT MATNR MEINS FROM MARA
    INTO CORRESPONDING FIELDS OF TABLE GT_MARA
    FOR ALL ENTRIES IN GT_STPO
    WHERE MATNR = GT_STPO-IDNRK.

  "获取价格
  IF R1 = 'X'.
    IF SWERKS IS NOT INITIAL.
      SELECT MATNR BWKEY STPRS PEINH FROM MBEW
        INTO CORRESPONDING FIELDS OF TABLE GT_MBEW
        FOR ALL ENTRIES IN GT_STPO
        WHERE MATNR = GT_STPO-IDNRK
          AND BWKEY = SWERKS.
    ELSE.

      SELECT BWKEY FROM T001K
        INTO CORRESPONDING FIELDS OF TABLE GT_T001K
        WHERE BWKEY NOT IN ('6010','6100','6540','6888')
          AND BWMOD = 'MY02'.
      LOOP AT GT_T001K INTO GS_T001K.
        IF GS_T001K-BWKEY+3(1) EQ '9'.
          DELETE GT_T001K.
        ENDIF.
      ENDLOOP.

      SELECT MATNR BWKEY STPRS PEINH FROM MBEW
        INTO CORRESPONDING FIELDS OF TABLE GT_MBEW
        FOR ALL ENTRIES IN GT_STPO
        WHERE MATNR = GT_STPO-IDNRK.

      LOOP AT GT_MBEW INTO GS_MBEW.
        READ TABLE GT_T001K TRANSPORTING NO FIELDS WITH KEY BWKEY = GS_MBEW-BWKEY.
        IF SY-SUBRC <> 0.
          DELETE GT_MBEW.
        ENDIF.
      ENDLOOP.
    ENDIF.
  ELSE.
    SELECT MATNR BWKEY STPRS PEINH FROM MBEW
        INTO CORRESPONDING FIELDS OF TABLE GT_MBEW
        FOR ALL ENTRIES IN GT_STPO
        WHERE MATNR = GT_STPO-IDNRK
          AND BWKEY = '6888'.
  ENDIF.

ENDFORM.                    " RETRIVE_DATA


*&---------------------------------------------------------------------*
*&      Form  PROCESS_DATA
*&---------------------------------------------------------------------*
*       text
*----------------------------------------------------------------------*
*  -->  p1        text
*  <--  p2        text
*----------------------------------------------------------------------*
FORM PROCESS_DATA .

  DF_LVC_FCAT:"FIELDNAME DATATYPE INTTYPE INTLEN DECIMALS
    'MATNR' 'C' 'C' 18 0,"物料
    'MAKTX' 'C' 'C' 40 0,"物料描述
    'MEINS' 'C' 'C' 3 0,"基本单位
    'CHECK' 'C' 'C' 4 0,"价格检查标识
    'LMEIN' 'C' 'C' 1 0."本报表价格单位

  IF R1 = 'X'.
    IF SWERKS IS NOT INITIAL.
      DF_LVC_FCAT:
        SWERKS 'P' 'P' 11 2."工厂价格
    ELSE.
      SORT GT_T001K.
      CLEAR GS_T001K.
      LOOP AT GT_T001K INTO GS_T001K.
        DF_LVC_FCAT:
          GS_T001K-BWKEY 'P' 'P' 11 2."工厂价格
        CLEAR GS_T001K.
      ENDLOOP.
    ENDIF.
  ELSE.
    DF_LVC_FCAT:
       '6888' 'P' 'P' 11 2.                                 "6888工厂价格
  ENDIF.

  CALL METHOD CL_ALV_TABLE_CREATE=>CREATE_DYNAMIC_TABLE
    EXPORTING
      IT_FIELDCATALOG = IFC
    IMPORTING
      EP_TABLE        = DNY_TAB.

  ASSIGN DNY_TAB->* TO $DNY_TAB>.
  CREATE DATA DNY_LINE LIKE LINE OF $DNY_TAB>.
  ASSIGN DNY_LINE->* TO  $DNY_WA>.

  CLEAR GS_STPO.
  LOOP AT GT_STPO INTO GS_STPO.
    "物料
    ASSIGN COMPONENT 'MATNR' OF STRUCTURE  $DNY_WA> TO  $DNY_FIELD>.
     = GS_STPO-IDNRK.
    "物料描述
    CLEAR GS_MAKT.
    READ TABLE GT_MAKT INTO GS_MAKT WITH KEY MATNR = GS_STPO-IDNRK.
    IF SY-SUBRC = 0.
      ASSIGN COMPONENT 'MAKTX' OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD> .
       = GS_MAKT-MAKTX.
    ENDIF.
    "基本单位
    CLEAR GS_MARA.
    READ TABLE GT_MARA INTO GS_MARA WITH KEY MATNR = GS_STPO-IDNRK.
    IF SY-SUBRC = 0.
      CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
        EXPORTING
          INPUT                = GS_MARA-MEINS
*         LANGUAGE             = SY-LANGU
        IMPORTING
*         LONG_TEXT            =
          OUTPUT               = GS_MARA-MEINS
*         SHORT_TEXT           =
*       EXCEPTIONS
*         UNIT_NOT_FOUND       = 1
*         OTHERS               = 2
                .
      IF SY-SUBRC <> 0.
* Implement suitable error handling here
      ENDIF.

      ASSIGN COMPONENT 'MEINS' OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD> .
       = GS_MARA-MEINS.
    ENDIF.
    "本报表价格单位
    ASSIGN COMPONENT 'LMEIN' OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD> .
     = '1'.
    "各工厂价格
    IF R1 = 'X'.
      IF SWERKS IS INITIAL.
        CLEAR: GS_MBEW,GS_T001K,COUNTER.
        SORT GT_T001K.
        LOOP AT GT_T001K INTO GS_T001K.
          ASSIGN COMPONENT GS_T001K-BWKEY OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD> .
          LOOP AT GT_MBEW INTO GS_MBEW WHERE MATNR = GS_STPO-IDNRK AND BWKEY = GS_T001K-BWKEY.
             = GS_MBEW-STPRS / GS_MBEW-PEINH.
            IF  NE 0.
              COUNTER = COUNTER + 1.
            ENDIF.
          ENDLOOP.
          IF SY-SUBRC <> 0.
             = 0.
          ENDIF.
        ENDLOOP.
        "价格检查标识
        ASSIGN COMPONENT 'CHECK' OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD>.
        IF COUNTER = LINES( GT_T001K ) AND COUNTER NE 0.
           = '@5B@'."GREEN
        ELSEIF COUNTER = 0.
           = '@5C@'."RED
        ELSE.
           = '@5D@'."YELLOW
        ENDIF.
      ELSE.
        CLEAR:GS_MBEW.
        ASSIGN COMPONENT SWERKS OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD>.
        READ TABLE GT_MBEW INTO GS_MBEW WITH KEY MATNR = GS_STPO-IDNRK BWKEY = SWERKS.
        IF SY-SUBRC = 0.
           = GS_MBEW-STPRS / GS_MBEW-PEINH.
          "价格检查标识
          IF  NE 0.
            ASSIGN COMPONENT 'CHECK' OF STRUCTURE  $DNY_WA> TO  $DNY_FIELD> .
             = '@5B@'."GREEN
          ELSE.
            ASSIGN COMPONENT 'CHECK' OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD> .
             = '@5C@'."RED
          ENDIF.
        ELSE.
           = 0.
          "价格检查标识
          ASSIGN COMPONENT 'CHECK' OF STRUCTURE  $DNY_WA> TO  $DNY_FIELD> .
           = '@5C@'."RED
        ENDIF.
      ENDIF.
    ELSE.
      CLEAR: GS_MBEW.
      ASSIGN COMPONENT '6888' OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD> .
      READ TABLE GT_MBEW INTO GS_MBEW WITH KEY BWKEY = '6888' MATNR = GS_STPO-IDNRK.
      IF SY-SUBRC = 0.
         = GS_MBEW-STPRS / GS_MBEW-PEINH.
        "价格检查标识
        IF  NE 0.
          ASSIGN COMPONENT 'CHECK' OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD>.
           = '@5B@'."GREEN
        ELSE.
          ASSIGN COMPONENT 'CHECK' OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD> .
           = '@5C@'."RED
        ENDIF.
      ELSE.
         = 0.
        "价格检查标识
        ASSIGN COMPONENT 'CHECK' OF STRUCTURE   $DNY_WA> TO  $DNY_FIELD>.
         = '@5C@'.
      ENDIF.
    ENDIF.
    APPEND   $DNY_WA> TO $DNY_TAB>.  .
    CLEAR GS_STPO.
  ENDLOOP.
ENDFORM.                    " PROCESS_DATA


*&---------------------------------------------------------------------*
*&      Form  PROCESS_OUTPUT
*&---------------------------------------------------------------------*
*       text
*----------------------------------------------------------------------*
*  -->  p1        text
*  <--  p2        text
*----------------------------------------------------------------------*
FORM PROCESS_OUTPUT .

  M_ALV_FIELDCAT:"FIELDNAME HEADING OUTPUTLEN ICON
        'MATNR' '物料' '18' '',
        'MAKTX' '物料描述' '40' '',
        'MEINS' '基本单位' '4' '',
        'CHECK' '价格检查标识' '4' 'X',
        'LMEIN' '本报表价格单位' '4' ''.

  IF R1 = 'X'.
    GV_TAB_DESC ?= CL_ABAP_TYPEDESCR=>DESCRIBE_BY_DATA( $DNY_TAB> ).
    GV_STC_DESC ?= GV_TAB_DESC->GET_TABLE_LINE_TYPE( ).
    DATA: LV_STR TYPE STRING.
    LOOP AT GV_STC_DESC->COMPONENTS ASSIGNING $FS_TAB>.
      IF $FS_TAB>-NAME EQ 'MATNR'
          OR $FS_TAB>-NAME EQ 'MAKTX'
          OR $FS_TAB>-NAME EQ 'MEINS'
          OR $FS_TAB>-NAME EQ 'CHECK'
          OR $FS_TAB>-NAME EQ 'LMEIN'.
        CONTINUE.
      ENDIF.
      CLEAR LV_STR.
      LV_STR = $FS_TAB>-NAME && '-工厂价格'.
      M_ALV_FIELDCAT:
           $FS_TAB>-NAME LV_STR '15' ''.
    ENDLOOP.
  ELSE.
    M_ALV_FIELDCAT:
         '6888' '6888-工厂价格' '15' ''.
  ENDIF.

****************************ALV LAYOUT******************************************
  GS_LAYOUT-COLWIDTH_OPTIMIZE = 'X'."宽度自动优化
  GS_LAYOUT-ZEBRA             = 'X'."斑马线

**********************TOP OF PAGR************************************************
  "Type H is used to display headers i.e. big font
  CLEAR GS_TOP.
  GS_TOP-TYP = 'H'.
  IF R1 = 'X'.
    GS_TOP-INFO = '投标报价主机BOM价格检查'.
  ELSE.
    GS_TOP-INFO = '投标报价项目物资相关BOM物料检查'.
  ENDIF.
  APPEND GS_TOP TO GT_TOP.

  "Type S is used to display key and value pairs
  IF R1 = 'X'.
    CLEAR GS_TOP.
    GS_TOP-TYP = 'S'.
    GS_TOP-KEY = '红灯：'.
    GS_TOP-INFO = '所有工厂价格为0'.
    APPEND GS_TOP TO GT_TOP.
    CLEAR GS_TOP.
    GS_TOP-TYP = 'S'.
    GS_TOP-KEY = '黄灯：'.
    GS_TOP-INFO = '一个工厂有价格不为0（排除绿灯条件）'.
    APPEND GS_TOP TO GT_TOP.
    CLEAR GS_TOP.
    GS_TOP-TYP = 'S'.
    GS_TOP-KEY = '绿灯：'.
    GS_TOP-INFO = '所有工厂价格都不为0'.
    APPEND GS_TOP TO GT_TOP.
    CLEAR GS_TOP.
    GS_TOP-TYP = 'S'.
    GS_TOP-KEY = '备注：'.
    GS_TOP-INFO = '只对所有主机工厂检查，且价格单位均为1'.
    APPEND GS_TOP TO GT_TOP.
  ELSE.
    CLEAR GS_TOP.
    GS_TOP-TYP = 'S'.
    GS_TOP-KEY = '备注：'.
    GS_TOP-INFO = '只检查6888工厂物料价格'.
    APPEND GS_TOP TO GT_TOP.
  ENDIF.

  "Type A is used to display italic font
*  CLEAR GS_TOP.
*  GS_TOP-TYP = 'A'.
*  GS_TOP-INFO = SY-DATUM.
*  APPEND GS_TOP TO GT_TOP.

*****************************ALV*****************************************
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      I_CALLBACK_PROGRAM     = SY-REPID
      I_CALLBACK_TOP_OF_PAGE = 'TOP_OF_PAGE'
      IS_LAYOUT              = GS_LAYOUT
      IT_FIELDCAT            = GT_FIELD
      I_DEFAULT              = 'X'
      I_SAVE                 = 'A'
    TABLES
      T_OUTTAB               = $ DNY_TAB> 
    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.                    " PROCESS_OUTPUT

*&---------------------------------------------------------------------*
*&      Form  top_of_page
*&---------------------------------------------------------------------*
FORM TOP_OF_PAGE.

  CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
    EXPORTING
      IT_LIST_COMMENTARY = GT_TOP.

ENDFORM.                    "top_of_page

*&---------------------------------------------------------------------*
*&      Form  FOO_BOM
*&---------------------------------------------------------------------*
*       text
*----------------------------------------------------------------------*
*      <--P_GT_STPO  text
*----------------------------------------------------------------------*
FORM FOO_BOM  CHANGING P_GT_STPO LIKE GT_STPO.

  IF P_GT_STPO IS INITIAL.
    MESSAGE TEXT-008 TYPE 'I'.
    RETURN.
  ENDIF.

  CLEAR:
        LT_MAST,
        LS_MAST,
        LT_STPO,
        LS_STPO.
  IF SWERKS IS NOT INITIAL.
    SELECT MATNR WERKS STLAN STLNR
      FROM MAST
      INTO CORRESPONDING FIELDS OF TABLE LT_MAST
      FOR ALL ENTRIES IN P_GT_STPO
      WHERE MATNR = P_GT_STPO-IDNRK
        AND WERKS EQ SWERKS
        AND STLAN EQ P1.
  ELSE.
    SELECT MATNR WERKS STLAN STLNR
      FROM MAST
      INTO CORRESPONDING FIELDS OF TABLE LT_MAST
      FOR ALL ENTRIES IN P_GT_STPO
      WHERE MATNR = P_GT_STPO-IDNRK
        AND STLAN EQ P1.
  ENDIF.
  IF LT_MAST IS NOT INITIAL.
    SELECT STLNR STLTY STLKN STPOZ IDNRK
      FROM STPO
      INTO CORRESPONDING FIELDS OF TABLE LT_STPO
      FOR ALL ENTRIES IN LT_MAST
      WHERE STLTY EQ 'M'
        AND STLNR = LT_MAST-STLNR.

    LOOP AT LT_MAST INTO LS_MAST.
      DELETE P_GT_STPO WHERE IDNRK = LS_MAST-MATNR.
    ENDLOOP.
    APPEND LINES OF LT_STPO TO P_GT_STPO.
    PERFORM FOO_BOM CHANGING P_GT_STPO.
  ENDIF.

ENDFORM.                    " FOO_BOM