Entity Framework + Team Foundation Server - edmx error

When I try to update the existing edmx Model while connected to TFS i receive an error: "XmlModels involved in this transasction are not editable".

What's even worse, is that when I try to generate a new model, Visual Studio just crashes out.

It happens only when I'm working online on a project, being connected to team foundation server.

So far the only solution I've found was to edit .edmx file using text editor...

Thanks in advance for any respons开发者_如何学JAVAes.

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From: http://connect.microsoft.com/VisualStudio/feedback/details/299134/vs2008-beta2-ado-net-entity-data-model-and-wpf-app-issues

Please make a copy of your edmx file before you attempt this action.!

For ADO.NET: Duplicate InheritanceConnectors and/or AssociationConnector seems to be the problem, so deleting everything in the edmx:Diagram tag except entitytypeshape fixes the problem when you save and open again.

Other people indicate that closing and re-opening the solution or rebinding to the source control system completely could have a positive effect.