The structure _name in the resue_alv_filedcatalog_merge.

Question

Hi
In
CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
  EXPORTING
  I_PROGRAM_NAME = ALV_PROG_NAME
  I_INTERNAL_TABNAME = ALV_ITAB_NAME
   I_STRUCTURE_NAME =
I_CLIENT_NEVER_DISPLAY = 'X'
  I_INCLNAME = ALV_PROG_NAME
I_BYPASSING_BUFFER =
I_BUFFER_ACTIVE =
  CHANGING
  CT_FIELDCAT = L_FIELDCAT
  EXCEPTIONS
  INCONSISTENT_INTERFACE = 1
  PROGRAM_ERROR = 2
  OTHERS = 3
In parameter    I_STRUCTURE_NAME =
if we define the structure like mara ,then filedcatalog is being prepared,
but if we define the structure in the program with types and write that structure in this parameter it is not taking.
but if we want to prepare the filedcatalog with program structure how can we prepare it?
what is the possible cause on not preparing the filedcatalog with the program structure
Thanks
Jatender

Answer 1

u can prepare the field catalog with program structure by using the FM REUSE_ALV_FIELDCATALOG_MERGE.
Check this code sample:
1. 1st declare the type for the internal table
types: begin of ty_purchasing,
        vrsio like s012-vrsio,                 " Version number in the
                                               " info structure
        spwoc like s012-spwoc,                 " Period to analyze-week
        ekorg like s012-ekorg,                 " Purchasing organization
        lifnr like s012-lifnr,                 " Vendor no.
        matnr like s012-matnr,                 " Material no.
        werks like s012-werks,                 " Plant
        basme like s012-basme,                 " Base unit of measure
        menge like s012-menge,                 " Purchase order quantity
        netwr like s012-netwr,                 " Effective order value
        name1 like lfa1-name1,                 " Vendor name
        maktx like makt-maktx,                 " Material description
        ekgrp like marc-ekgrp,                 " Purchasing group
       end of ty_purchasing.
All fields must be declared with LIKE not with TYPE otherwise FM
REUSE_ALV_FIELDCATALOG_MERGE will not work.
2. Define the internal table
data:       i_purchasing type standard table of ty_purchasing initial size 0.
3. Pass the internal table name to fm REUSE_ALV_FIELDCATALOG_MERGE
  call function 'REUSE_ALV_FIELDCATALOG_MERGE'
   exporting
     i_program_name            = sy-repid      " Internal table
                                               " declaration program
     i_internal_tabname        = 'I_PURCHASING'" Output table name
   changing
     ct_fieldcat               = i_fieldcat    " Field catalog with
                                               " field descriptions
   exceptions
     inconsistent_interface    = 1
     program_error             = 2
     others                    = 3
  if sy-subrc <> 0.
    message i000 with text-012.                " Error using function
    " module REUSE_ALV_
    " FIELDCATALOG_MERGE
    leave list-processing.
  endif.
Regards,
joy.