Helpfulness feature for forum

Hi Everybody,

I found this solved artical for the topic: http://community.lithium.com/t5/Developers-Discussion/Configuring-ratings-helpfulness/m-p/249115#M10618.

As described there I inserted the following code to the forum page:

<component id="ratings.widget.rating-enum-display" ratingSystemRef="conv:helpfulness"/>

And configured the Lithium Admin with the following rating styles: "helpfulness":

But the rating doesn´t show up at the forum pages.

Has anybody an idea why?

Thanks

Marko