Gets the unique constraint used by fk. If this FK constraint is a 1:1 fk constraint, and the Fk side is not a PK, it has to be that the FK constraint uses a unique constraint in the FK table which is equal to the set of FK fields. If that's the case, this method returns that unique constraint, otherwise null.

public DBUniqueConstraint GetUniqueConstraintUsedByFk()

Public Function GetUniqueConstraintUsedByFk As DBUniqueConstraint