GUI_DOWNLOAD Function module is changing turkish characters to #

Hi All ,

I am facing a problem while downloading a file using FM - GUI_DOWNLOAD.

While downloading the data from the internal table to text file the one of the field

vendor name in which some of the charcters are is in turkish character

ie ,Name = ARAS KARGO YURTİÇİ YURTDIŞI TAŞ.AŞ ,the characters I ,C,S are getting changed to #.

Can you please help me.

Please find the code.

CALL FUNCTION 'GUI_DOWNLOAD'

EXPORTING

* BIN_FILESIZE =

filename = filename_string

filetype = 'ASC'

* CONFIRM_OVERWRITE = ' '

* NO_AUTH_CHECK = ' '

* CODEPAGE = ' '

* IGNORE_CERR = ABAP_TRUE

* REPLACEMENT = '#'

* WRITE_BOM = ' '

* TRUNC_TRAILING_BLANKS_EOL = 'X'

TABLES

data_tab = ta_download