open dataset in binary mode-data missing in pdf file

Hi,

I am downloading a pdf file to the appl server using the below code.

open dataset filename for output in binary mode.

OPEN DATASET file_name FOR OUTPUT IN BINARY MODE.
     LOOP AT lines INTO ls_lines.
       TRANSFER ls_lines TO file_name.
     ENDLOOP.
     CLOSE DATASET file_name.
     MESSAGE 'File has been Transfered' TYPE 'S'.

pdf file is downloading to the appl server.

I am reading the file using CG3Y transaction, an found that some tax values are missing.

please advice on how to fix this issue ASAP.