Print PDF file with timestamp in background.

Hi Experts,

I have a requirement to print PDF files which is loaded through Tcode CV01N and assigned in material master.

While printing production order traveller form thru Tcode COHV (Mass Processing), those assign PDF file (design document) should print with timestamp at bottom of the each page.

I have tried to print PDF file using class CL_GUI_FRONTEND_SERVICE method EXECUTE but it opens the file then I have click on print.

Please suggest me solution.

Thanks,

Roshan.