REUSE_ALV_FIELDCATALOG_MERGE

Question

Hello I would like to know what are the exporting and changig parameters are inducating. I would need a detailed description of them. Thanks in advance.
CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
EXPORTING
  I_PROGRAM_NAME               =
  I_INTERNAL_TABNAME           =
  I_STRUCTURE_NAME             =
  I_CLIENT_NEVER_DISPLAY       = 'X'
  I_INCLNAME                   =
  I_BYPASSING_BUFFER           =
  I_BUFFER_ACTIVE              =
  CHANGING
    CT_FIELDCAT                  =
EXCEPTIONS
  INCONSISTENT_INTERFACE       = 1
  PROGRAM_ERROR                = 2
  OTHERS                       = 3

Answer 1

Hi,
Check this documentation
1)     I_PROGRAM_NAME (Export Parameter)
This is the name of the program from which the function module is called or the program having the exit routines.
2)     I_INTERNAL_TABNAME (Export Parameter)
This is the name of the internal table to be displayed.
3)     I_STRUCTURE_NAME (Export Parameter)
If the internal table to be displayed is defined using a Dictionary structure (INCLUDE STRUCTURE xyz or LIKE xyz), then the field catalog can be built by passing the structure name.  The key fields of the structure will form the key fields of the list also.
4)     I_CLIENT_NEVER_DISPLAY (Export Parameter)
This parameter is used to handle the client field in the structure passed. If this parameter is left blank, then client fields (type CLNT) in the structure passed are flagged as technical (=> no screen output) in the field catalog.                 
5)     I_INCLNAME (Export Parameter)
If the output internal table is not declared in the TOP include, then the include in which this table is declared is to be passed here (If the structure is not passed).  If the output table is declared in the same program, pass the program name here.
6)     I_BYPASSING_BUFFER, I_BUFFER_ACTIVE (Export Parameters)
When the program is run for the first time, the fields present in the output table and their positions are stored in a buffer.  So the buffer is taken as reference for the successive executions.  In order to bypass this buffer the above parameter values should be ‘X’ and  ‘ ‘(space) respectively. If these values are not passed to the function module, the changes made in the structure of the internal table MAY NOT be reflected in the output.
7)     CT_FIELDCAT (Import Parameter)
Field catalog (table) containing the descriptions and properties of the output fields.
Regards
Sailaja.