[fluent-nhib] Is it possible to use IUserType as an Id in Fluent Hibernate mapping?

[Marcin Wieczorek]

I'm fairly new to NHibernate and even more so to Fluent NHibernate, so 
forgive such a basic question.

I have a IUserType defined class and I want to use it as an Id of a table. 
When using Native generator I get an exception

InnerException: System.InvalidOperationException
    Message=Identity type must be integral (int, long, uint, ulong)
    Source=FluentNHibernate

Here is a snipped of my object definition: 


class ObjectIdType: IUserType
{
    private static readonly NHibernate.SqlTypes.SqlType[] SQL_TYPES = { 
NHibernateUtil.UInt64.SqlType };

    public NHibernate.SqlTypes.SqlType[] SqlTypes
    {
        get { return SQL_TYPES; }
    }

    public Type ReturnedType
    {
        get { return typeof(ObjectId); }
    }

    ...
}

Is it possible to have a user type as an Id of the column where the Id is 
not an integer value?

Thanks

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