[luis999]

Quiza te sirve lo siquiente:

TYPES: text3 TYPE c LENGTH 101.

DATA: T_CONT TYPE TABLE OF text3.
DATA: BEGIN OF IT_CONT OCCURS 0,
DATO(101) TYPE C.
DATA: END OF IT_CONT.

DATA: BEGIN OF IT_EXPORT OCCURS 0,
DATO TYPE STRING.
DATA: END OF IT_EXPORT.


.................
llenas los datos
.................
IT_CONT-DATO+18(15) = VL_WRBTRT.
*Cantidad de registros de beneficiarios
IT_CONT-DATO+33(15) = '000000000000000'.
*Cantidad de registros enviados
IT_CONT-DATO+48(15) = LINEASTC.


APPEND IT_CONT-DATO TO T_CONT.
concatenate LINES OF T_CONT into IT_EXPORT-dato respecting blanks.

APPEND IT_EXPORT.
CLEAR IT_EXPORT.

CALL FUNCTION 'GUI_DOWNLOAD'
EXPORTING
filename = l_filename
filetype = 'ASC'
* trunc_trailing_blanks = ' '
trunc_trailing_blanks_eol = ' ' "Deja los espacios en blanco
TABLES
data_tab = IT_EXPORT.