Ассоциация с именем "<var>X</var>", определенная для типа сущности "<var>Type Name</var>", недопустима. Параметр IsForeignKey может быть равен true только на одной стороне ассоциации.

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Association named '<var>X</var>' defined on entity type '<var>Type Name</var>' is invalid: one and only one side of the association must have IsForeignKey set to true.

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