Pb unicode with function CONVERT_OTF_2_PDF

Hello,

I have a problem.

I have to convert a smartform on PDF. I'm using the function CONVERT_OTF_2_PDF like this :

CALL FUNCTION 'CONVERT_OTF_2_PDF'

IMPORTING

bin_filesize = p_filesize

TABLES

otf = lt_itcoo

doctab_archive = lt_doctab

lines = lt_tline

EXCEPTIONS

err_conv_not_possible = 1

err_otf_mc_noendmarker = 2

OTHERS = 3.

But in return i have a problem in the table lt_tline. the result is not unicode.

can you help me?