Calling ME28N from webdynpro

Hi Experts,

My requirement is to call the me28n from the wbedynpro component skipping the first screen & displaying the selected purchase order.

I have am calling following URL but its not skipping the first screen.

CONCATENATE 'http'
'://' host ':' port
'/sap/bc/gui/sap/its/webgui/?sap-client=&~transaction=*ME29n EKKO-EBELN=' lv_ebeln ';T16FC-FRGCO=' lv_im_rel_code '&~OKCODE=SHOW&'
INTO url.

Please hep me with the correct URL.

Thanks,

sangeeta