Entity-splitting scenario in EF4 CTP5 code-first implementation?

I think it is not possible. Fist problem is that EF is not able to use unique keys (will be probably available in next major version ). So you can't enforce 1:1 relation between Customer->Id and User->CustId (which requires unique key constraint).

To enable 1:1 relation in EF, entities must "share" PK. It means that you can create 1:1 relation only on Customer->Id and User->Id which you obviously don't want.

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