Unable to display header using  REUSE_ALV_FIELDCATALOG_

Hi SDNers,
I was working on REUSE_ALV_FIELDCATALOG_MERGE.
I am able to get the output, but it is not displaying any header on the output list.
Regards,
Ranjith N

Hi,
I am using standard ddic fields.
*& Report  ZVIC_INTERACTIVE_TEST1
REPORT  ZVIC_INTERACTIVE_TEST1.
type-pools : slis.
tables : t004.
data : begin of t_co occurs 0,
       ktopl type ktopl,
       end of t_co.
data : w_co like line of t_co.
DATA: it_fieldcat TYPE  slis_t_fieldcat_alv.
CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
EXPORTING
   I_PROGRAM_NAME               = sy-repid
   I_INTERNAL_TABNAME           = 'T_CO'
*   I_STRUCTURE_NAME             =
*   I_CLIENT_NEVER_DISPLAY       = 'X'
   I_INCLNAME                   = sy-repid
*   I_BYPASSING_BUFFER           =
*   I_BUFFER_ACTIVE              =
  CHANGING
    ct_fieldcat                  = it_fieldcat
* EXCEPTIONS
*   INCONSISTENT_INTERFACE       = 1
*   PROGRAM_ERROR                = 2
*   OTHERS                       = 3
SELECT ktopl FROM t004 INTO CORRESPONDING FIELDS OF w_co UP TO 20 ROWS.
append w_co to t_co.
endselect.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
*   I_INTERFACE_CHECK                 = ' '
*   I_BYPASSING_BUFFER                = ' '
*   I_BUFFER_ACTIVE                   = ' '
   I_CALLBACK_PROGRAM                = sy-repid
*   I_CALLBACK_PF_STATUS_SET          = ' '
*   I_CALLBACK_USER_COMMAND           = ' '
*   I_CALLBACK_TOP_OF_PAGE            = ' '
*   I_CALLBACK_HTML_TOP_OF_PAGE       = ' '
*   I_CALLBACK_HTML_END_OF_LIST       = ' '
*   I_STRUCTURE_NAME                  =
*   I_BACKGROUND_ID                   = ' '
*   I_GRID_TITLE                      =
*   I_GRID_SETTINGS                   =
*    IS_LAYOUT                         = layout
    IT_FIELDCAT                       =  it_fieldcat
*   IT_EXCLUDING                      =
*   IT_SPECIAL_GROUPS                 =
*   IT_SORT                           =
*   IT_FILTER                         =
*   IS_SEL_HIDE                       =
*   I_DEFAULT                         = 'X'
*   I_SAVE                            = ' '
*   IS_VARIANT                        =
*   IT_EVENTS                         =
*   IT_EVENT_EXIT                     =
*   IS_PRINT                          =
*   IS_REPREP_ID                      =
*   I_SCREEN_START_COLUMN             = 0
*   I_SCREEN_START_LINE               = 0
*   I_SCREEN_END_COLUMN               = 0
*   I_SCREEN_END_LINE                 = 0
*   I_HTML_HEIGHT_TOP                 = 0
*   I_HTML_HEIGHT_END                 = 0
*   IT_ALV_GRAPHICS                   =
*   IT_HYPERLINK                      =
*   IT_ADD_FIELDCAT                   =
*   IT_EXCEPT_QINFO                   =
*   IR_SALV_FULLSCREEN_ADAPTER        =
* IMPORTING
*   E_EXIT_CAUSED_BY_CALLER           =
*   ES_EXIT_CAUSED_BY_USER            =
  TABLES
    t_outtab                          = T_CO
* 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.
Regards,
Ranjith N

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