Our database schema has a Payer table with a unique id key named
PayerId.  A very few of these payers are special, so we use a primary
key relationship table called DefaultPayer to denote which of those
payers are designated as default payers.  DefaultPayer also has
PayerId as its primary key, but DefaultPayer.PayerId has a foreign key
constraint to Payer.  However, this is a purely subset relation, not a
subclassing scenario.  We really don't want a DefaultPayer entity
class; it hacks up our domain model.  Is there a way to tell
NHibernate about the relation without creating another entity?

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