[beltsoft]

1. Construir tu catalogo de forma normal

CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
EXPORTING
i_structure_name = 'SFLIGHT'
CHANGING
ct_fieldcat = pt_fieldcat[]
EXCEPTIONS
inconsistent_interface = 1
program_error = 2
OTHERS = 3.
IF sy-subrc <> 0.
*--Exception handling
ENDIF.

2. Una vez con tu catalogo definir el tamaño de salida en LS_FCAT-OUTPUTLEN.

LOOP AT pt_fieldcat INTO ls_fcat .
CASE pt_fieldcat-fieldname .
WHEN 'CARRID' .
ls_fcat-outpulen = '10' .
ls_fcat-coltext = 'Airline Carrier ID' .
MODIFY pt_fieldcat FROM ls_fcat .
WHEN 'PAYMENTSUM' .
ls_fcat-no_out = 'X' .
MODIFY pt_fieldcat FROM ls_fcat .
ENDCASE .
ENDLOOP .