String variable truncated - ECC6

Hello Experts,

I'm using a string variable to save the filepath. The problem is that when the filepath is longer than 132 characters, the variable gets truncated.

DATA: baja TYPE String.
DATA: lv_path TYPE STRING,
      lv_long TYPE i,
      lv_tipo(4),
l_sel_folder TYPE String.

CLEAR baja.
lv_long = STRLEN( l_sel_folder ).

lv_long = lv_long - 4.
lv_path = l_sel_folder(lv_long).
CONCATENATE lv_path '-ERR-' sy-datum '-' sy-uzeit '.TXT' INTO baja.


CALL METHOD cl_gui_frontend_services=>gui_download
  EXPORTING
*    bin_filesize              =
    filename                  = baja

I have tried to find a solution in the forum with no luck. How can I resolve this?

Thanks in advance and regards!