GUI_DOWNLOAD field seperator not appering in downloaded data

Hi Experts,

I am dowladong data on presentation server using GUI_DOWNLOAD fm . the write fieldseperator i have passed is

'|' which is no appearing at end of each record . below is my code

CALL FUNCTION 'GUI_DOWNLOAD'

EXPORTING

filename = 'D:/test.txt'

write_field_separator = '|'

TABLES

data_tab = itab

EXCEPTIONS

OTHERS = 22.

and the output is

000000000000000001 ROH 00000000

000000000000000002 00000000

000000000000000003 00000000

000000000000000004 ROH 00000000

Thamnks in advance