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The property "TherapistId" cannot be configured as navigation property. The property must be a valid entity type and the property should have non-abstract getter and setter. For collection properties the type must implement ICollection where T is a valid entity type. I have no idea what is wrong with TherapistId - maybe the whole idea of the. 2020. 9. 6. · Primary and Foreign keys are a very simple relational database concept. Until very recently Excel users didn’t have to worry about relationships because Excel didn’t support them. This all changed when Microsoft added.