Using Smartforms with SAP ITS

Hi Abapers,

                 I have a requirement where in i need to publish smartform in PDF format with SAP ITS , is there anyone who has worked on similar requirement, Any help?

Code I am using to show the PDF is below

CALL METHOD cl_hrge_document_services=>show_pdf

     EXPORTING

       pdf_data_tab     = it_lines

       pdf_data_size    = l_pdf_len

       pdf_viewer       = a_pdf_viewer

       mess_handler     = mess_handler

       display_in_place = open_inplace

     IMPORTING

       is_ok            = is_ok.

when I execute the code i am getting 'The report did not produce any data for the selections.'

Any suggestions???