Schema specified is not valid. Errors: The relationship was not loaded because the type is not available

Question

I wish to reference the OrderAddress model twice in my Order model; once as a ShippingAddress and once as a Billing

Answer 1

In my case, the problem is because of table name conflict.

I have another edmx model that has some tables with similar names. Just click on the table in the designer, then in the properties change the name to something different!