Launch Webdynpro Problem

Hi all ,

I have configured an Purchase Order UWL link to launch webdynpro application which was newly developed.

In which we are passing workitem id with that , so it will open the particular PO in WDA Application , The problem we are facing is that whenever we click the UWL Link from Portal It is not launching the WDA Application , instead it is remaining blank and trying to connect again and again like refreshing (i,e it is refreshing the URL again and again and not showing anything on the screen) , can anyone help me with this . And provide me with some documents to configure.

Thanks & Regards ,

RameshVinay