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    public class CardMatchMap : ClassMap<CardMatch>
    {
        public CardMatchMap()
        {
            Id(x => x.MatchId).Column("MATCHID");

            References(x => x.Employee).Column("EMPNO");
            References(x => x.Card).Column("CARDID").Not.LazyLoad().Cascade.SaveUpdate();
        }
    }

    public class CardMatch
    {
        public virtual int MatchId { get; set; }
        public virtual Card Card { get; set; }
        public virtual Employee Employee { get; set; }
    }

    public class EmployeeMap : ClassMap<Employee>
    {
        public EmployeeMap()
        {
            Id(x => x.Id);
            Map(x => x.Name);
        }
    }

    public class Employee
    {
        public virtual int Id { get; set; }
        public virtual string Name { get; set; }
    }

    public class CardMap : ClassMap<Card>
    {
        public CardMap()
        {
            Id(x => x.Id);
            Map(x => x.Limit);
        }
    }

    public class Card
    {
        public virtual int Id { get; set; }
        public virtual int Limit { get; set; }
    }

    class Program
    {
        private static ISessionFactory factory;
        static void Main(string[] args)
        {
            using (var session = OpenSession())
            {
                var cardMatch = session.Get<CardMatch>(1);
                cardMatch.Card.Limit = 333;

                session.Flush();
            }
        }

        public static NHibernate.Cfg.Configuration BuildConfiguration()
        {
            return
                Fluently.Configure()
                    .Database(MsSqlConfiguration.MsSql2008
                        .ConnectionString(c => c
                            .Server("localhost")
                            .Database("NHibernate")
                            .TrustedConnection()))
                    .Mappings(m => m.FluentMappings.AddFromAssemblyOf<Program>())
                    .BuildConfiguration();
        }

        public static ISession OpenSession()
        {
            if (factory == null)
            {
                factory = BuildConfiguration()
                  .BuildSessionFactory();
            }

            return factory.OpenSession();
        }
    }