The Relation property of the {0} refers to the {1} end of the {2}, which is not bound to a set of uniquely constrained columns ...

The Relation property of the {0} refers to the {1} end of the {2}, which is not bound to a set of uniquely constrained columns for the {3}. Roles with Cardinality of One or OptionalOne require relations bound to uniquely constrained columns of the table.