Linq anonymous type sub collection query

Hi I'm trying to execute the following query but the result has the following error.

Also when I run this with normal entity framework the code executes and results are fine. Is this a bug? If so are there any kind of work around you can suggest?

"Unable to cast object of type 'System.Object[]' to type 'System.Collections.Generic.IEnumerable`1[<>f__AnonymousType0`3[System.Int64,System.String,System.String]]'."
 var query = (EntityQuery)(from makes in em.VehicleMakes
                                      orderby makes.MakeName
                                      select new
                                      {
                                          Key = makes.VehicleMakeId,
                                          Name = makes.MakeName,
                                          Description = makes.MakeCode,
                                          Children = from model in makes.VehicleModels
                                                     select new
                                                     {
                                                         Key = model.VehicleModelId,
                                                         Name = model.ModelName,
                                                         Description = model.ModelCode
                                                     }
                                      });

Edited by tersiusk - 09-May-2011 at 6:22am