problem in alv fieldcat function

data: begin of it_mara occurs 100,

matnr LIKE mara-matnr,

ernam LIKE mara-ernam,

ersda LIKE mara-ersda,

mtart LIKE mara-mtart,

end of it_mara.

-

i am using the above mentioned int tab.

the following function is returning an error which states that ..

"The ABAP program lines are wider than the internal table."

-

i_repid = sy-repid.

CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'

EXPORTING

I_PROGRAM_NAME = i_repid

I_INTERNAL_TABNAME = 'IT_MARA'

• I_STRUCTURE_NAME =

• I_CLIENT_NEVER_DISPLAY = 'X'

I_INCLNAME = i_repid

• I_BYPASSING_BUFFER =

• I_BUFFER_ACTIVE =

CHANGING

CT_FIELDCAT = int_fcat

EXCEPTIONS

INCONSISTENT_INTERFACE = 1

PROGRAM_ERROR = 2

OTHERS = 3

.

plz suggest how this problem can be resolved ..