Command doubt

could any one give me idea for the below stmts
DATA: w_keyinfo TYPE slis_keyinfo_alv.
w_keyinfo-header01 = 'VBELN'.
w_keyinfo-item01 = 'VBELN'.
thanks

hi,
this is used to specify that according to which field u want hierarchy....
means i want that according to material number i want hierarchical display than i have to pass matnr in this
and
key_info-header01 = 'MAT'.
key_info-item01 = 'MAT'.
In this we passing field name of header table and item table....
Now see this example..
In this i want hierarchy depend on Material and palnt both..
so my code will be
TYPE-POOLS : slis.
TABLES : mseg.
DATA : BEGIN OF itab_head OCCURS 0,
 mat LIKE mseg-matnr,
 matnr LIKE mseg-matnr,
 werks LIKE mseg-werks,
 END OF itab_head.
DATA : BEGIN OF itab_item OCCURS 0,
 mat LIKE mseg-matnr,
 matnr LIKE mseg-matnr,
 werks LIKE mseg-werks,
 mblnr LIKE mseg-mblnr,
 menge LIKE mseg-menge,
 END OF itab_item.
DATA : t_fcat TYPE slis_t_fieldcat_alv,
 key_info TYPE slis_keyinfo_alv,
 t_eve TYPE slis_t_event,
 gt_subtot TYPE slis_t_sortinfo_alv,
 subtot LIKE LINE OF gt_subtot,
 t_listhead TYPE slis_t_listheader,
 st_line TYPE slis_listheader.
DATA : t_mtdoc LIKE mseg-mblnr.
SELECT-OPTIONS : mat FOR mseg-matnr.
INITIALIZATION.
PERFORM build_cat USING t_fcat.
PERFORM build_eve.
START-OF-SELECTION.
PERFORM get_data.
PERFORM dis_data.
*& Form build_cat
 text
 -->TEMP_FCAT text
FORM build_cat USING temp_fcat TYPE slis_t_fieldcat_alv.
DATA : wa_fcat TYPE slis_fieldcat_alv.
wa_fcat-tabname = 'ITAB_HEAD'.
wa_fcat-fieldname = 'MAT'.
wa_fcat-seltext_m = 'Material'.
APPEND wa_fcat TO temp_fcat.
CLEAR wa_fcat.
wa_fcat-tabname = 'ITAB_HEAD'.
wa_fcat-fieldname = 'WERKS'.
wa_fcat-seltext_m = 'Plant'.
APPEND wa_fcat TO temp_fcat.
CLEAR wa_fcat.
wa_fcat-tabname = 'ITAB_ITEM'.
wa_fcat-fieldname = 'MBLNR'.
wa_fcat-seltext_m = 'Material Doc.'.
APPEND wa_fcat TO temp_fcat.
CLEAR wa_fcat.
wa_fcat-tabname = 'ITAB_ITEM'.
wa_fcat-fieldname = 'MENGE'.
wa_fcat-seltext_m = 'Quantity'.
wa_fcat-do_sum = 'Y'.
APPEND wa_fcat TO temp_fcat.
CLEAR wa_fcat.
subtot-spos = 1.
subtot-fieldname = 'MAT'.
subtot-tabname = 'ITAB_HEAD'.
subtot-up = 'X'.
subtot-group = 'X'.
subtot-subtot = 'X'.
subtot-expa = 'X'.
APPEND subtot TO gt_subtot.
ENDFORM. "build_cat
*& Form build_eve
 text
FORM build_eve.
DATA : wa_eve TYPE slis_alv_event.
CALL FUNCTION 'REUSE_ALV_EVENTS_GET'
 EXPORTING
 i_list_type = 0
 IMPORTING
 et_events = t_eve
EXCEPTIONS
 LIST_TYPE_WRONG = 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. "build_eve
*& Form get_data
 text
FORM get_data.
SELECT matnr AS mat werks mblnr menge FROM mseg INTO CORRESPONDING FIELDS OF TABLE itab_item
WHERE matnr IN mat.
ENDFORM. "get_data
*& Form dis_data
 text
FORM dis_data.
key_info-header01 = 'MAT'.
key_info-item01 = 'MAT'.
key_info-header02 = 'WERKS'.
key_info-item02 = 'WERKS'.
REFRESH itab_head.
LOOP AT itab_item.
 ON CHANGE OF itab_item-mat OR itab_item-werks.
 MOVE-CORRESPONDING itab_item TO itab_head.
 APPEND itab_head.
 ENDON.
ENDLOOP.
CALL FUNCTION 'REUSE_ALV_HIERSEQ_LIST_DISPLAY'
 EXPORTING
 i_callback_program = 'ZALV_PRDS'
 it_fieldcat = t_fcat
 it_sort = gt_subtot
 it_events = t_eve[]
 i_tabname_header = 'ITAB_HEAD'
 i_tabname_item = 'ITAB_ITEM'
 is_keyinfo = key_info
 TABLES
 t_outtab_header = itab_head
 t_outtab_item = itab_item
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. "dis_data
reward if usefull.....

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