Adding group to form causes error

I'm not sure what's going on, but I'm getting an error whenever I try to include related data in a form.

I have a tables called members and boats. Boats includes a datajoin element that stores the member's id. I have a right join between members and boats (a member can own multiple boats). When I add the resulting members[boats] element group to the members form, an error is generated when trying to view the form or list.
The error reads: Fabrik has generated an incorrect query for the list Members: <br />

While the group name members[boats] shows up as an available group in the members' form, when I go to view elements by group, the group name does not appear as an option. It also does not appear in the trash nor unpublished lists.

Any clue what's going on here?
 
We are in need of some funding.
More details.

Thank you.

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