PLM search (wda_sea_qs) gives page not found when started from portal

In NWBC the PLM search works fine. For result it starts the result webdynpro.

We use PLM from the portal so I have created an iview for the webdynopro wda_sea_qs.

When I click on advanced search or search for something the navigation to the other webdynpro's is not working.

All we get is an new portal page with the message "page not found"

How can I configure the search to work correct from the portal?

Greetings

Rob