Ассоциация "<var>X</var>.<var>Y</var>" помечена атрибутом RequiredAttribute. Удалите атрибут RequiredAttribute и вместо этого отметьте им нижележащие элементы внешних ключей.

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Association '<var>X</var>.<var>Y</var>' is marked with RequiredAttribute. Please remove the attribute and mark the underlying foreign key members with RequiredAttribute instead.

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