Error mapping table per subclass in Fluent NHibernate

[AumSingh]

I will give details of the infrastructure I have built and will talk about the problem in the end. Database table "dbo.SmartPhoneBase" details: Following are the columns in the table.

SmartPhoneBaseID (Identity Primary Key)
Company
PhoneName
RAM
Storage

Database table "dbo.SamsungPhone" details: Following are the columns in the table.

SamsungPhoneID (Identity Primary Kay)
SmartPhoneBaseID (Foreign Key to dbo.SmartPhoneBase)
AndroidVersion
QualcommProcessorTech
AMOLEDDisplayTech

Entity classes for the above tables:

public class SmartPhoneBase
{
public virtual int SmartPhoneBaseID { get; private set; }

    public virtual string Company { get; set; }

    public virtual string PhoneName { get; set; }

    public virtual string RAM { get; set; }

    public virtual string Storage { get; set; }
}

public class SamsungPhone:SmartPhoneBase
{
public virtual string AndroidVersion { get; set; }

    public virtual string QualcommProcessorTech { get; set; }

    public virtual string AMOLEDDisplayTech { get; set; }
}

Mapping class for the above entity classes:

public class SmartPhoneBaseMap:ClassMap
{
public SmartPhoneBaseMap()
{
Schema("dbo");
Table("SmartPhoneBase");

        Id(x => x.SmartPhoneBaseID)
            .Column("SmartPhoneBaseID")
            .GeneratedBy.Identity();

        Map(x => x.Company).Length(100).Not.Nullable();
        Map(x => x.PhoneName).Length(100).Not.Nullable();
        Map(x => x.RAM).Length(100).Not.Nullable();
        Map(x => x.Storage).Length(100).Not.Nullable();
    }
}

public class SamsungPhoneMap:SubclassMap
{
public SamsungPhoneMap()
{
Schema("dbo");
Table("SamsungPhone");

        Map(x => x.AndroidVersion).Length(100).Not.Nullable();
        Map(x => x.QualcommProcessorTech).Length(100).Not.Nullable();
        Map(x => x.AMOLEDDisplayTech).Length(100).Not.Nullable();
    }
}

Please note following points. 1. For the subclass "SamsungPhone" the primary key is not allowed to be mapped with the method Id() hence I did not keep the property for same reason in the subclass even though its corresponding table "dbo.SamsungPhone" has a primary key.

[AumSingh]

Well guys I just got the answer to the above problem. I just missed this mapping in the class SamsungPhoneMap

KeyColumn("SmartPhoneBaseID");

I did not see this being mentioned anywhere, not even the Fluent Nhibernate talks about it. But all's well that ends well, I got the answer at last.