Thai character in print preview PDF

Hi All,

Why is it when I print preview smartform output in PDF format, all thai characters printed as funny characters?

My command is as below:

control_parameters-no_dialog = 'X'.

control_parameters-getotf = 'X'.

output_options-tddataset = 'SMART'.

output_options-tdsuffix2 = sy-uname.

output_options-tdimmed = 'X'.

output_options-tddelete = 'X'.

output_options-tdlifetime = '1'.

output_options-tdcopies = '1'.

CALL FUNCTION 'SSF_FUNCTION_MODULE_NAME'

EXPORTING

formname = 'ZMM_VMR_01'

IMPORTING

fm_name = lf_fm_name

EXCEPTIONS

no_form = 1

no_function_module = 2

OTHERS = 3.

CLEAR job_output_info.

CALL FUNCTION lf_fm_name

EXPORTING

user_settings = ' '

control_parameters = control_parameters

output_options = output_options

IMPORTING

job_output_info = job_output_info

TABLES

sitab = t_basic_t[]

EXCEPTIONS

formatting_error = 1

internal_error = 2

send_error = 3

user_canceled = 4

OTHERS = 5.

Is there anything missing? do I have to print to spool and then read from spool to preview via PDF? What user want is to preveiw in PDF and if they are satisfied, they will save the document from PDF.

Juli.

Edited by: Julimainoe Mohd Noh on Oct 10, 2011 11:29 AM