POCO And Master/Details

Good afternoon,

I was trying to create a sample project with a Master / Details and POCO's and am having a problem.

The property (EntityAspect) of my Detail is always with the null value. 
What am I doing wrong?

Could you send me an example to work or see
what's going on with my example??
 SalesOrderHeader:
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Runtime.Serialization;
using IdeaBlade.EntityModel;

namespace SalesPoco
{
    [DataContract]
    public class SalesOrderHeader : IHasEntityAspect, INotifyPropertyChanged
    {

        [Key]
        [DataMember]
        public int SalesOrderID
        {
            get { return _SalesOrderID; }
            set
            {
                _SalesOrderID = value;
                OnPropertyChanged("SalesOrderID");
            }
        }
        private int _SalesOrderID;

        [DataMember]
        public int CustomerID
        {
            get { return _CustomerID; }
            set
            {
                _CustomerID = value;
                OnPropertyChanged("CustomerID");
            }
        }
        private int _CustomerID;

        [DataMember]
        public decimal TotalDue
        {
            get { return _TotalDue; }
            set
            {
                _TotalDue = value;
                OnPropertyChanged("TotalDue");
            }
        }
        private decimal _TotalDue;

        [DataMember]
        public string Comment
        {
            get { return _Comment; }
            set
            {
                _Comment = value;
                OnPropertyChanged("Comment");
            }
        }
        private string _Comment;

        [DataMember]
        [Association("SalesOrderHeader_SalesOrderDetail", "SalesOrderID", "SalesOrderID")]
        public List<SalesOrderDetail> SalesOrderDetails
        {
            get { return _SalesOrderDetails; }
            set
            {
                _SalesOrderDetails = value;
                OnPropertyChanged("SalesOrderDetails");
            }
        }
        private List<SalesOrderDetail> _SalesOrderDetails;

        #region IHasEntityAspect Members

        public EntityAspect EntityAspect
        {
            get;
            set;
        }

        #endregion

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string property)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(property));
            }
        }

        #endregion
    }
}

SalesOrderDetail:

using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Runtime.Serialization;
using IdeaBlade.EntityModel;
namespace SalesPoco
{
    [DataContract]
    public class SalesOrderDetail : IHasEntityAspect, INotifyPropertyChanged
    {
        [Key]
        [DataMember]
        public int SalesOrderID
        {
            get { return _SalesOrderID; }
            set
            {
                _SalesOrderID = value;
                OnPropertyChanged("SalesOrderID");
            }
        }
        private int _SalesOrderID;

        [Key]
        [DataMember]
        public int SalesOrderDetailID
        {
            get { return _SalesOrderDetailID; }
            set
            {
                _SalesOrderDetailID = value;
                OnPropertyChanged("SalesOrderDetailID");
            }
        }
        private int _SalesOrderDetailID;

        [DataMember]
        public short OrderQty
        {
            get { return _OrderQty; }
            set
            {
                _OrderQty = value;
                OnPropertyChanged("OrderQty");
            }
        }
        private short _OrderQty;

        [DataMember]
        public int ProductID
        {
            get { return _ProductID; }
            set
            {
                _ProductID = value;
                OnPropertyChanged("ProductID");
            }
        }
        private int _ProductID;

        [DataMember]
        public decimal UnitPrice
        {
            get { return _UnitPrice; }
            set
            {
                _UnitPrice = value;
                OnPropertyChanged("UnitPrice");
            }
        }
        private decimal _UnitPrice;

        #region IHasEntityAspect Members

        public EntityAspect EntityAspect
        {
            get;
            set;
        }

        #endregion

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string property)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(property));
            }
        }

        #endregion

    }
}

Server:

using System;
using System.Collections.Generic;
using IdeaBlade.Core.DomainServices;
namespace SalesPoco
{
    [EnableClientAccess]
    public class SalesPocoServiceProvider
    {
        public SalesPocoServiceProvider() { }

        public IEnumerable<SalesOrderHeader> GetSalesOrderHeader()
        {
            IEnumerable<SalesOrderHeader> states = ReadSalesOrderHeader();
            return states;
        }

        private IEnumerable<SalesOrderHeader> ReadSalesOrderHeader()
        {
            List<SalesOrderHeader> lstSalesOrderHeader = new List<SalesOrderHeader>();

            SalesOrderHeader orderHeader = new SalesOrderHeader();
            orderHeader.SalesOrderID = 1;
            orderHeader.CustomerID = 123;
            orderHeader.Comment = "Test";
            orderHeader.TotalDue = 12;
            orderHeader.SalesOrderDetails = ReadSalesOrderDetails(orderHeader.SalesOrderID);

            lstSalesOrderHeader.Add(orderHeader);

            return lstSalesOrderHeader;
        }

        private List<SalesOrderDetail> ReadSalesOrderDetails(int SalesOrderID)
        {
            List<SalesOrderDetail> listOrderDetail = new List<SalesOrderDetail>();
            for (int i = 0; i < 4; i++)
            {
                SalesOrderDetail orderDetail = new SalesOrderDetail();
                orderDetail.SalesOrderID = SalesOrderID;
                orderDetail.SalesOrderDetailID = i;
                orderDetail.ProductID = Convert.ToInt32("0011" + i.ToString());
                orderDetail.OrderQty = 1;
                orderDetail.UnitPrice = 10;
                listOrderDetail.Add(orderDetail);
            }
            return listOrderDetail;
        }

    }
}

Regards,

Sergio Magalhaes