Possibility to define relations in multiple ways

[joesiltberg]

Currently a relation between two datatypes can only be defined in one way. It could be helpful if it was possible to add alternative definitions.

An example use case is where regular staff uses attribute schoolUnitCode to find their SchoolUnit, but staff for preschools have a different attribute (say unitCodeOther) which perhaps should be matched against a different attribute in the SchoolUnit objects.

Request from Båstad.