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 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

This does not work unless you change the Instance Options

(control-right click, to get to "Instance Options").

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