Look, I have these pretty simple model Master-Detail:

Hand is master of Fingers (finger is a detail of hand)

So on the client side:

```
Hand hand = domainService.Hands[0];                 //  get some hand, doesn't matter
...
Finger f = new Finger() { f.Id = Guid.NewId() };
f.Hand = hand;                                      //  make connection !!
domainService.Fingers.Add(f);
domainService.SubmitChanges(OnSubmitCompleted, null);   //  error is here

```

On the Server Side:

```
public void Insert<T>(T obj)
{
    try
    {
        using (ISession session = _factory.OpenSession())
        using (ITransaction transaction = session.BeginTransaction())
        {
            session.SaveOrUpdate(obj);   //  NHibernate error: not-null property references a null or transient value
            transaction.Commit();
        }
    }
    catch (Exception ex)
    {
        throw ;
    }
}

```

***The problem actually is about not sending associations back via WCF wire. So On the server side the Hand property is NULL, but it shouldn't (violation) - I just want to refresh my finger.Hand property***

It's not even a composition - I don't need this cause of its limitations

here is the metaAttribute class:

```
    [MetadataType(typeof(Finger.FingerMetadata))]
public partial class Finger
{
    //[Required(AllowEmptyStrings = true)]
    //[Exclude]
    public virtual Guid HandID { get; set; }
    //{
    //    get { return Hand.Id; }
    //}

    internal sealed class FingerMetadata
    {
        [Key]
        public Guid Id  { get; set; }

        [Include]
        //[RoundtripOriginal]
        //[ExternalReference]
        [Association("Finger-Hand", "HandID", "Id")]
        //[ConcurrencyCheck]
        //[Composition]
        public Hand Hand { get; set; }
    }
}

[MetadataType(typeof(Hand.HandMetadata))]
public partial class Hand
{
    internal sealed class HandMetadata
    {
        [Key]
        public Guid Id  { get; set; }

        [Include]
        //[ExternalReference]
        [Association("Hand-Finger", "Id", "HandID")]
        //[Composition]
        public IList<Finger> Fingers { get; set; }
    }
}

```

I saw the same problem here <http://forums.silverlight.net/forums/p/205220/480824.aspx>, but nobody knows..
Please help!

Thanks!