Voyager not showing entries in dropdown

I have created two tables ("pmeg_entities" and "pmeg_collections") and defined a relationship between the two (multiple pmeg_collections to a pmeg_entity).

In the BREAD model for the pmeg_collection I have selected the dropdown element for the entity_id (which coorelates to the relationship), but in use it is showing me an empty list. I am expecting this to be populated by the values found in the pmeg_entities.

Is this correct expectation? Is there more I have to do?