Fluent NHibernate Automapping with abstract base class

Question

Given the classes below:

public class Address : Place
{
    public virtual string Street { get; set; }
    public virtual int Number  { get; set; }


    public override string WhereAmI
    {
        get { string.Format("{0} {1}", Street , Number); }
    }
}
public abstract class Place : DomainEntity
{
    public abstract string WhereAmI { get; }
}

When I use this mapping:

var autoMap = AutoMap.AssemblyOf<Party>()
            .Override<Place>(map => map.IgnoreProperty(p => p.WhereAmI))
            .Override<Address>(map => map.IgnoreProperty(p => p.WhereAmI))
            .Where(type => type.Namespace != null && type.Namespace.Contains("Models"));

I still get the error: Could not find a setter for property 'WhereAmI' in class 'Address'

Things I did:

• When i remove the property from the base class "Address" it works.
• When i use .OverrideAll(map => map.IgnoreProperty("WhereAmI")) But I don't want it to be global because in another class i might use the same property name where I DO want to include this Property

Is there any way to get this to work other then to use an Interface?