I have something like this
public class ProductViewModel
{
public int SelectedProductId { get; set; }
public string ProductName {get; set;}
public int
The error your getting is because you cannot declare mapping declarations more than one level deep in your object graph.
Because you've only posted one property its hard for me to give you the codes that will make this work. One option is to change your viewmodel property to MyTestTestId and the conventions will automatically pick up on that.