CodeRule causes errors in the Validation module when opening the Model.xafml file

We have a problem opening the Model.xafml from the Solution.Web project in an XAF app.
I have duplicated it in the attached solution, both on my PC and a co-workers PC.
We both are using Visual Studio 2005 SP1 (Version 8.0.50727.762 (SP.050727-7600)
and I updated to DevX and XAF 8.3.4 yesterday.
Steps to Reproduce:
1>First Close visual Studio, not just close project, completely exit Visual Studio (VS)
2> Open VS and open the attached solution
3> Rebuild the Solution
4> Open the Model.xafml from the TestModel.Web Project.
4.1> This should work without a problem
5> Close the model.xafml
6> Rebuild the Solution
7> Open the Model.xafml from the TestModel.Web Project.
7.1> This time it fails with a "'DevExpress.ExpressApp.Validation.ValidationModule' update model: Another rule with ID = 'CodeRule1.NameRule' already exists." error
Actual Results:
Exception occurs while the 'DevExpress.ExpressApp.Validation.ValidationModule' update model: Another rule with ID = 'CodeRule1.NameRule' already exists.
Existing rule:
'<CodeRule1 ID=":CodeRule1.NameRule" Name=":" CustomMessageTemplate=":" TargetType=":TestModel.Module.DomainObject1" TargetContextIDs=":Save" InvertResult=":False" SkipNullOrEmptyValues=":True" TargetCriteria=":"/>'
New rule:
'<CodeRule1 ID=":CodeRule1.NameRule" Name=":" CustomMessageTemplate=":" TargetType=":TestModel.Module.DomainObject1" TargetContextIDs=":Save" InvertResult=":False" SkipNullOrEmptyValues=":True" TargetCriteria=":"/>'
Expected Results:
This should obviously not happen, Strange thing is that if you don;t exit VS but close the solution and open another and go it it's model.xafml in the web project you get the same Error!