Error in alv report (fieldcatlog is not found)

Question

Hai Genious
i am a new of the sap-abap, i have a one problem in my alv report, now i am using the reuse_alv_ fieldcatlog_merge,
i declared with my internal table with type,
my error is :- fieldcatlog not found
for example
types: begin of ty_mara,
matnr type matnr,
meins type meins,
ersda type ersda,
ernam type ernam,
end of ty_mara.
data: wa_mara type ty_mara,
it_mara like table of wa_mara.
select matnr meins ersda ernam from mara into table it_mara.
CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
EXPORTING
I_PROGRAM_NAME = SY-REPID
I_INTERNAL_TABNAME = 'IT_MARA'
I_STRUCTURE_NAME =
I_CLIENT_NEVER_DISPLAY = 'X'
I_INCLNAME = SY-REPID
IF sy-subrc 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
call function 'reuse_alv_list_display'

Answer 1

Hi,
CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
EXPORTING
I_PROGRAM_NAME = SY-REPID
I_INTERNAL_TABNAME = 'IT_MARA'
I_STRUCTURE_NAME = 'TY_MARA'-->give it
I_CLIENT_NEVER_DISPLAY = 'X'
I_INCLNAME = SY-REPID
IF sy-subrc 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
also use...
CHANGING
      ct_fieldcat                  = i_fieldtab
data :i_fieldtab TYPE slis_t_fieldcat_alv,
s_fieldtab_body TYPE slis_fieldcat_alv.
fill i_fieldtab like this...
CASE s_fieldtab_body-fieldname.
      WHEN 'OA_NO'.
        s_fieldtab_body-seltext_l = 'Order Accep. No.'.
        MODIFY i_fieldtab FROM s_fieldtab_body INDEX sy-tabix.
        CLEAR s_fieldtab_body.
      WHEN 'KTEXT'.
        s_fieldtab_body-seltext_l = 'Ramco Order No.'.
        MODIFY i_fieldtab FROM s_fieldtab_body INDEX sy-tabix.
        CLEAR s_fieldtab_body.
and so on