RELATED TO ALV GRID

Question

hi all,
In alv reports which r done using object oriented concepts, im able to print all the fields
of a table by passing  LFA1 table  to the parameter I_STRUCTUE_NAME of  method
SET TABLEFOR_FIRST_DISPLAY and IT_OUTTAB as ITAB.
I declared ITAB as...DATA:ITAB TYPE TABLE OF VBAK .
Now, the problem is...if i want to declare my ITAB with only few fields then wat is the method i have to use to display and wat r the parameters i have to pass...so that my output will have only the columns i declared and not the whole structure of LFA1.

Answer 1

Hello Aturi
Do not create the fieldcatalog manually but use the function module LVC_FIELDCATALOG_MERGE.
If you need only a few fields out of a structure you could use the following coding:
DATA:
  gs_fcat   TYPE lvc_s_fcat,
  gt_fcat    TYPE lvc_t_fcat.
  CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
    EXPORTING
      i_structure_name = 'LFA1'
    CHANGING
      ct_fieldcat           = gt_fcat.
  gs_fcat-no_out = 'X'.  " column is visible neither on ALV list nor in the layout
  MODIFY gt_fcat FROM gs_fcat
    TRANSPORTING FIELD no_out
  WHERE ( no_out ne 'X' ).
" Make all required columns visible again...
  LOOP AT gt_fcat INTO gs_fcat
                            WHERE ( fieldname = 'required column'    AND
                                           fieldname = ... ).
    gs_fcat-no_out = ' '.
    MODIFY gt_fcat FROM gs_fcat.
  ENDLOOP.
If you need fields from different tables you can repeatedly call the function module and use the logic above. To distinguish between fields of different tables simply add:
  LOOP AT gt_fcat INTO gs_fcat
                            WHERE ( ref_table = 'LFA1' )
                            AND      ( fieldname = ... ).
  ENDLOOP.
Regards
  Zwe