http://developers.de/blogs/damir_dobric/archive/2008/05/24/entity-framework-how-referential-integrity-works.aspxFor everybody who is interested on internals of Entity Framework (ER) in relation to referential integrity, I would recommend this ADO.NET team article written by elisaj: http://blogs.msdn.com/adonet/pages/how-referential-integrity-works.aspx . AnotherenCommunityServer 2008 SP1 (Build: 30619.63)