WCF Data Services: MaxProtocolVersion set at v2 despite Service set at v3. Ends up Throwing error on OfType()

I'm having a problem that when I attempt to do a linq query against my odata service with the OfType() method, I get an error saying that the request isn't valid for a Version 2 service. I have created the WCF Data Service and have set the MaxProtocolVersion to v3. ``` public class TestDirectorySearch : DataService<TestDirectoryEntities> { public static void InitializeService(DataServiceConfiguration config) { config.SetEntitySetAccessRule("*", EntitySetRights.AllRead); config.SetEntitySetPageSize("*", 50); config.UseVerboseErrors = true; config.DataServiceBehavior.MaxProtocolVersion = System.Data.Services.Common.DataServiceProtocolVersion.V3; } } ``` My edmx has the following line: ``` <edmx:DataServices m:DataServiceVersion="1.0" m:MaxDataServiceVersion="3.0" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"> ``` When I attempt to do the following query I get an error saying that the "The method 'OfType' is not supported when MaxProtocolVersion is less than '3.0'." ``` from test in context.Tests.OfType<OrderableTest>() where test.TestRevisionId.Equals(mmt.RevisionId) select new { Reflex = test.ReflexTest , ShipTemp = (test.SpecimenTemperature == null) ? null : test.SpecimenTemperature.DisplayDescription }).FirstOrDefault(); ``` If I check the MaxProtocolVersion of my context, it is set at v2. At what point is this failing? What can I do to set this correctly? Exact error: {"The method 'OfType' is not supported when MaxProtocolVersion is less than '3.0'."} Requested stack trace: ``` at System.Data.Services.Client.ResourceBinder.AnalyzeOfType(MethodCallExpression mce, DataServiceProtocolVersion maxProtocolVersion) at System.Data.Services.Client.ResourceBinder.VisitMethodCall(MethodCallExpression mce) at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp) at System.Data.Services.Client.DataServiceALinqExpressionVisitor.Visit(Expression exp) at System.Data.Services.Client.ALinqExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original) at System.Data.Services.Client.ALinqExpressionVisitor.VisitMethodCall(MethodCallExpression m) at System.Data.Services.Client.ResourceBinder.VisitMethodCall(MethodCallExpression mce) at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp) at System.Data.Services.Client.DataServiceALinqExpressionVisitor.Visit(Expression exp) at System.Data.Services.Client.ResourceBinder.AnalyzeProjection(MethodCallExpression mce, SequenceMethod sequenceMethod, Expression& e) at System.Data.Services.Client.ResourceBinder.VisitMethodCall(MethodCallExpression mce) at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp) at System.Data.Services.Client.DataServiceALinqExpressionVisitor.Visit(Expression exp) at System.Data.Services.Client.ALinqExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original) at System.Data.Services.Client.ALinqExpressionVisitor.VisitMethodCall(MethodCallExpression m) at System.Data.Services.Client.ResourceBinder.VisitMethodCall(MethodCallExpression mce) at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp) at System.Data.Services.Client.DataServiceALinqExpressionVisitor.Visit(Expression exp) at System.Data.Services.Client.ResourceBinder.Bind(Expression e, DataServiceContext context) at System.Data.Services.Client.DataServiceQueryProvider.Translate(Expression e) at System.Data.Services.Client.DataServiceQuery`1.Translate() at System.Data.Services.Client.DataServiceQuery`1.Execute() at System.Data.Services.Client.DataServiceQuery`1.GetEnumerator() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) at System.Data.Services.Client.DataServiceQueryProvider.ReturnSingleton[TElement](Expression expression) at System.Data.Services.Client.DataServiceQueryProvider.Execute[TResult](Expression expression) at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source) at TDMixBLL.TestDirectoryServiceHandler.PopulateOrderableTestInfo(MonitoredMixTest mmt) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 161 at TDMixBLL.TestDirectoryServiceHandler.PopulateTestInfo(MonitoredMixTest test) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 124 at TDMixBLL.TestDirectoryServiceHandler.GetTest(Int64 testRevisionId) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 112 at TDMixBLL.TestDirectoryServiceHandler.PopulateTests(List`1 testsToPopulate) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 66 at TDMix2.Tests.TestRetrievalTests.TestPopulate() in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMix2.Tests\TestRetrievalTests.cs:line 38 ```