How can I define a selection criteria that is not only on foreign keys in a foreign reference mapping?
Foreign reference mappings internally use a selection query to read objects from the target. This selection query is like any other read query, and can be accessed to provide advanced customization on the mapping’s query. The selection query can itself be changed to provide a custom query if complex querying is required. If you have a relationship that is not solely based on foreign keys, an expression can be given to the mappings selection criteria.
