问代码NHibernate映射OneToOne:不使用唯一键

EN

public class ServiceEvent
{
    public long Id { get; set; }
    **public virtual Customer CustomerRef { get; set; }**

    public long ServiceId { get; set; }
    public string Test { get; set; }
}

public class Customer
{
    public long Id { get; set; }
    **public virtual ServiceEvent Event { get; set; }**

    public string TestCustomer { get; set; }
    public long CustonerId { get; set; }
}

    public ServiceEventMap()
    {
        Id(x => x.Id, m => m.Generator(Generators.Native));
        Property(x => x.ServiceId, m => {m.Unique(true); m.NotNullable(true);});
        Property(x => x.Test);
        OneToOne(x => x.CustomerRef, m => m.PropertyReference(typeof(Customer).GetPropertyOrFieldMatchingName("Event")));
    }

    public CustomerMap()
    {
        Id(x => x.Id, m => m.Generator(Generators.Native));
        Property(x => x.CustonerId);
        Property(x => x.TestCustomer);
        ManyToOne(x => x.Event, m =>
        {
            m.PropertyRef("ServiceId");
            m.Column(mc =>
            {
                mc.Name("service_id");
                mc.NotNullable(true);
            });
            m.ForeignKey("fk_service_event_customer");
        });
    }