Data transfer error open dataset files

Question

hi,
When i try to create a excel or text in my application server using open dataset.
i.e
l_filename type rlgrap-filename  value '/tmp/down.txt'.
I got a short dump during the run time
i got the output and put into an internal table.
the following code has been used.
form user_command using r_ucomm like sy-ucomm
rs_selfield  type slis_selfield.
if r_ucomm = 'confirm' .
OPEN DATASET l_fname FOR OUTPUT IN TEXT MODE ENCODING DEFAULT.
LOOP AT it_out INTO wa_out.
  IF sy-subrc = 0.
    TRANSFER wa_out TO l_filename.
  ENDIF.
ENDLOOP.
endform.
during the execution i hv a button alv grid outpu. when i click the button the file should be transferred.
but NO authorization to open the file "/tmp/down.txt".
and the error is pointed in the opendataset line.
Please tell me where i am wrong . and  help me in resoving this.

Answer 1

Try this..instead of moving field by field into the file 1st convert all he fields to a character stream..and then move that steam to file. Ex:
loop at internal table into l_h_tbl_file.
concatenate l_h_tbl_file-f1 l_h_tbl_file-f2 l_h_tbl_file-f3
l_h_tbl_file-f4 l_h_tbl_file-f5 into g_string.
TRANSFER g_string TO fu_wk_get_file.
endloop.