So the other day I was asked to set up the redirect from a record producer on the Service Portal. This was no problem in the past CMS, and the normal GUI.
The docs say it should just be a simple line of code like;

producer.url_redirect="home.do";//for CMS and GUI redirects
producer.portal_redirect="?id=page";//for Service Portal redirects

However this does not work unless you modify the Instance Options (control-right click, to get to “Instance Options”).

Instance
Options

This however is the same widget that renders your other catalog items and all of them will redirect too.