"Field Catalog not found" ...problem in ALV reporting !!

Question

Hi,
When i execute my report program where in I generate a Selection screen, I am able to select the values in the selection screen. Once I click on the execute button I get the message
"Field Catalog not found"...
The elabore message is
"Field Catalog cannot be determined becaus the output table structure name was not specified"
Where am I wrong ??
Find below my code ...
*& Report  Z_MIGO_TXJCD_REPORT
REPORT  Z_MIGO_TXJCD_REPORT.
TYPE-POOLS: slis.
TABLES:  makt,mseg,zmigo_extend,ttxj,mkpf.
DATA: BEGIN OF migo_data OCCURS 0,
       matnr LIKE mseg-matnr,
       werks LIKE mseg-werks,
       lgpla LIKE mseg-lgpla,
       bwart LIKE mseg-bwart,
       menge LIKE mseg-menge,
       dmbtr LIKE mseg-dmbtr,
       budat LIKE mkpf-budat,
       txjcd LIKE zmigo_extend-txjcd,
      END OF migo_data.
DATA: it_cat TYPE slis_t_fieldcat_alv,
      wa_lay TYPE slis_layout_alv.
FIELD-SYMBOLS: <fs_cat> LIKE LINE OF it_cat.
SELECT-OPTIONS: so_matnr FOR makt-matnr,
                so_budat FOR mkpf-budat,
                so_werks FOR mseg-werks,
                so_lgpla FOR mseg-lgpla,
                so_bwart FOR mseg-bwart,
                so_txjcd FOR ttxj-txjcd.
START-OF-SELECTION.
  SELECT amatnr awerks algpla abwart
         amenge admbtr bbudat ctxjcd INTO TABLE
         migo_data
    FROM mseg AS a INNER JOIN mkpf AS b ON amblnr = bmblnr INNER JOIN
         zmigo_extend AS c ON amblnr = cmblnr
   WHERE a~matnr IN so_matnr
     AND b~budat IN so_budat
     AND a~werks IN so_werks
     AND a~lgpla IN so_lgpla
     AND a~bwart IN so_bwart
     AND c~txjcd IN so_txjcd.
  CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
    EXPORTING
      i_program_name         = sy-cprog
      i_internal_tabname     = 'migo_data'
      i_inclname             = sy-cprog
    CHANGING
      ct_fieldcat            = it_cat
    EXCEPTIONS
      inconsistent_interface = 1
      program_error          = 2
      OTHERS                 = 3.
  LOOP AT it_cat ASSIGNING <fs_cat>.
    CLEAR <fs_cat>-key.
  ENDLOOP.
  wa_lay-zebra = 'X'.
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      i_grid_title  = 'MIGO report with Tax Jurisdiction Code'
      is_layout     = wa_lay
      it_fieldcat   = it_cat
    TABLES
      t_outtab      = migo_data
    EXCEPTIONS
      program_error = 1
      OTHERS        = 2.

Answer 1

Give 'migo_data' in uppercase as ''MIGO_DATA'.