有时候需要下面这种效果：
使用的是参数：I_CALLBACK_TOP_OF_PAGE
代码比较简单，在demo10的基础上。
代码如下：
REPORT ZLM_ALV011.
DATA:GT_DATA TYPE TABLE OF SPFLI.
DATA:GS_LAYOUT TYPE SLIS_LAYOUT_ALV.
DATA:CT_FIELDCAT TYPE SLIS_T_FIELDCAT_ALV.
DATA:GT_FIELDCATALOG TYPE SLIS_T_FIELDCAT_ALV .
DATA:LS_CT_FIELDCAT LIKE LINE OF CT_FIELDCAT.
DATA:LS_IT_FIELDCATALOG LIKE LINE OF GT_FIELDCATALOG.
DATA:LV_ALV_STRUCTURE TYPE DD02L-TABNAME VALUE 'ZLMS_ALV'.
DATA: G_GRID_TOP_OF_PAGE TYPE SLIS_T_LISTHEADER.
START-OF-SELECTION.
SELECT * FROM SPFLI INTO TABLE GT_DATA.
CLEAR CT_FIELDCAT[].
CLEAR GT_FIELDCATALOG[].
CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
EXPORTING
I_STRUCTURE_NAME = LV_ALV_STRUCTURE
CHANGING
CT_FIELDCAT = CT_FIELDCAT
EXCEPTIONS
INCONSISTENT_INTERFACE = 1
PROGRAM_ERROR = 2
OTHERS = 3.
IF SY-SUBRC <> 0.
ENDIF.
LOOP AT CT_FIELDCAT INTO LS_CT_FIELDCAT .
MOVE-CORRESPONDING LS_CT_FIELDCAT TO LS_IT_FIELDCATALOG.
LS_IT_FIELDCATALOG-SELTEXT_L = LS_CT_FIELDCAT-SELTEXT_L.
LS_IT_FIELDCATALOG-SELTEXT_M = LS_CT_FIELDCAT-SELTEXT_M.
LS_IT_FIELDCATALOG-SELTEXT_S = LS_CT_FIELDCAT-SELTEXT_S.
LS_IT_FIELDCATALOG-DDICTXT ='L'.
APPEND LS_IT_FIELDCATALOG TO GT_FIELDCATALOG.
ENDLOOP.
GS_LAYOUT-COLWIDTH_OPTIMIZE = 'X'.
GS_LAYOUT-ZEBRA = 'X'.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
I_DEFAULT = 'X'
I_SAVE = 'X'
I_CALLBACK_PROGRAM = SY-REPID "当前程序
I_CALLBACK_TOP_OF_PAGE = 'FRM_COMMENT_BUILD'
I_GRID_TITLE = 'SAP干货铺测试'
IS_LAYOUT = GS_LAYOUT
IT_FIELDCAT = GT_FIELDCATALOG
* I_STRUCTURE_NAME = 'SPFLI'
TABLES
T_OUTTAB = GT_DATA
EXCEPTIONS
PROGRAM_ERROR = 1
OTHERS = 2.
IF SY-SUBRC <> 0.
* Implement suitable error handling here
ENDIF.
*&---------------------------------------------------------------------*
*& Form COMMENT_BUILD
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
FORM FRM_COMMENT_BUILD .
DATA: LS_LINE TYPE SLIS_LISTHEADER.
CLEAR G_GRID_TOP_OF_PAGE[].
CLEAR LS_LINE.
LS_LINE-TYP = 'H'. " H = Header, S = Selection, A = Action
LS_LINE-INFO = 'SAP干货铺测试'.
APPEND LS_LINE TO G_GRID_TOP_OF_PAGE.
CLEAR LS_LINE.
LS_LINE-TYP = 'S'.
* LS_LINE-KEY = 'SAP干货铺'.
CONCATENATE 'SAP干货铺测试日期：'SY-DATUM
INTO LS_LINE-INFO .
APPEND LS_LINE TO G_GRID_TOP_OF_PAGE.
CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
EXPORTING
IT_LIST_COMMENTARY = G_GRID_TOP_OF_PAGE.
ENDFORM. " COMMENT_BUILD
