CP2 to CP3: Fetch group ID from answer table

Content

Hi,

I am trying to fetch the group id from the answer table to display on our answer view page. In the CP2 framework it seems that this would have worked by referring to the answers table (answers.assgn_group_id).

I have tried to display the group id in the CP3 framework using the below code snippet but am running into an error:

<rn:field name="Answer.assgn_group_id"/>

Error with rn:field tag: Primary object Answer is not supported

How would I retrieve the group id in the CP3 framework?

Thanks.

Version

Customer Portal 3.6

Code Snippet