NHibernate引用不要'保存外键

我有两个相互引用的类。这是一个奇怪的情况，我们的CRM需要。

我有一个组织和EmAddress表和类。组织从订阅服务器继承，订阅服务器也有一个表。我认为这可能是我的问题，或者我不能在这些上设置逆，因为没有"HasMany"…

插入/更新的顺序是…插入电子邮件插入组织UPDATE Email设置Email。订户

电子邮件。订阅者需要为"NOT NULL"，所以这不起作用。我怎么能改变顺序，我不能用逆，因为没有列表。只有两个参考

    public class Organization : Subscriber
    {
       public override string Class { get { return "Organization"; } }
       EmAddress PrimaryEmailAddress {get;set;}
    }
    public class OrganizationMap : SubclassMap<Organization>
    {        
      public OrganizationMap()
      {
        Table("Organization");
        KeyColumn("Organization");
        References(x => x.PrimaryEmail,"PrimaryEmailAddress").Cascade.SaveUpdate();
      }
    }
    public EmAddressMap()
    {
        Id(x => x.Id, "EmAddress");
        Map(x => x.EmailAddress, "eMailAddress");
        References<Subscriber>(x => x.Subscriber,"Subscriber").LazyLoad().Fetch.Select().Not.Nullable(); 
        /*not.nullable() throw s error.  NHibernate INSERTS email, INSERTS org, UPDATES email. */
   }
   public class EmAddress
   {
    public virtual Guid Id { get; set; }
    public virtual string EmailAddress { get; set; }
    public virtual Subscriber Subscriber { get; set; }
   }
     //Implementation
     var session = NHIbernateHelper.GetSession();
     using(var tx = session.BeginTransaction())
{
     var org = new Organization();
     org.PrimaryEmail = new EmAddress(){Subscriber = org};
     session.Save(org);
     tx.commit();

}