Inheritance and composite foreign keys - one part of the key in base class, the other part in derived class

Question

I am having problems to create an Entity Framework Code-First mapping for the following sample database schema (in SQL Server):

Answer 1

I think it is simpler and reduces complexity to have Table --> TableId (PK) --> other columns including FKs.

So in your example - adding a CustomerId column to the Customers table would solve your problem.