NHibernate Mapping: saving hierarchy in one table without discriminator

Question

I have a very extensible and modular application. I want to extend the displayed Entites from other assemblies. However, I still need to work with the base classes.

Example:

Mapping the parent class in assembly A:

    public class PersonMap : ClassMap<Person> 
    {
        public PersonMap()
        {
            Table("Persons");

            Id(x => x.Id).GeneratedBy.Assigned();
        }
}

Mapping child classes in assembly B:

public class EmployeeMap : SubclassMap<Employee>
{
    public EmployeeMap()
    {
        Table("Persons");
        Extends(typeof(Person));

        KeyColumn("Id");

        LazyLoad();

        HasMany<Assignments>(x => x.Assignments).KeyColumn("Id").Inverse().Cascade.AllDeleteOrphan().LazyLoad().NotFound.Ignore();
    }
}

Now, when I create Person in some Assembly A code, it is saved as NHibernate's Employee. And this leads to the exclusion of the cast class due to proxying whenever I save Person and try to update it in Assembly A. Assembly A should not have a dependency on assembly B.

I need to work with the parent class in all assembly methods A. The child class is used only in other assemblies.

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