An entity class with a property of List or ICollection of Int does not work.

public class Foo
 {
     public ICollection<int> RowValues { get; set; }
     public ICollection<int> ColValues { get; set; }
 }

Here is the error message.
The property 'RowValues' on entity type 'Models.Foo' has not been added to the model or ignored.

Is this a bug or am I doing this wrong?

Thanks