Build fieldcatalog from a catalog type lvc_t_fcat

Question

Hi experts,
i'm getting a short dump when i want to create a field catalog using function module REUSE_ALV_FIELDCATALOG_MERGE.
Short dump says:
Runtime Error          CALL_FUNCTION_CONFLICT_TAB_TYP
Exception              CX_SY_DYN_CALL_ILLEGAL_TYPE  
and i think it came from type of fieldcatalog.
Internal table:
BEGIN OF it_za91 OCCURS 0,
        kschl LIKE konp-kschl,
        kunnr LIKE kna1-kunnr,
        mfrnr LIKE mara-mfrnr,
        kbetr LIKE konp-kbetr,
        konwa LIKE konp-konwa,
        datab LIKE a908-datab,
        datbi LIKE a908-datbi,
        field_style TYPE lvc_t_styl,
      END OF it_za91.
Fieldcatalog
DATA: fieldcatalog TYPE lvc_t_fcat
What should i do?
Thank you.

Answer 1

Thank you my friends.
I'm getting this strange behavior when i call FM LVC_FIELDCATALOG_MERGE. If i declare a local structure when i call FM LVC_FIELDCATALOG_MERGE fieldcatalog would be empty. If I'm creating a structure from SE11 , it's OK.
So, everytime when i want to create am LVC fieldcatalog i must create a structure from SE11 ???
DATA: BEGIN OF st_za91,
        kschl LIKE konp-kschl,
        kunnr LIKE kna1-kunnr,
        mfrnr LIKE mara-mfrnr,
        name1 LIKE lfa1-name1,
        brsch LIKE lfa1-brsch,
        kbetr LIKE konp-kbetr,
        konwa LIKE konp-konwa,
        datab LIKE a908-datab,
        datbi LIKE a908-datbi,
        END OF st_za91.
DATA: it_za91 LIKE STANDARD TABLE OF st_za91 WITH HEADER LINE,
           fieldcatalog TYPE lvc_t_fcat.
  CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
   EXPORTING
*   I_BUFFER_ACTIVE              =
   i_structure_name             = 'ST_ZA91'
     i_client_never_display       = 'X'
*   I_BYPASSING_BUFFER           =
*      i_internal_tabname           = 'IT_ZA91'
   CHANGING
     ct_fieldcat                  = fieldcatalog
*  EXCEPTIONS
*    inconsistent_interface       = 1
*    program_error                = 2
*    OTHERS                       = 3
In this way fieldcatalog would be empty.
There is a way to create a fieldcatalog using LVC_FIELDCATALOG_MERGE but without creating a structure via SE11?