Table per hierarchy inheritance with POCO entities in Entity Framework 4?

This is complaining not about database mapping, but model to CLR mapping.

What I didn't represent before (I didn't think it relevant, but it was). Was that CreditCardPayment inherited from an intermediary class named "CreditPayment" and ACHPayment inherited from CashPayment. CreditCardPayment and CashPayment live in the same namespace and file, but were not represented in the EF mapping.

Once I added those within the mapping file, everything worked ok.

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