CRM 2011, вопрос по плагину

[mistah]

товарищи, добрый день!

подскажите, пожалуйста, по плагину.. он делает следующее - обновляет сущность new_zayavka, создает Заказ, прописывает в Заказ название, прайслист, валюту, клиента и заблокированы ли цены.
Эта часть отрабатывает как надо. Но я захотел добавить еще и продукт в этот Заказ, вот тут-то мне Плагин и выдал ошибку "the parent id is missing".

Плагин повешен на Update сущности new_zayavka, на Pre-validation.

спасибо!

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: The parent id is missing.Detail: 
<OrganizationServiceFault xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/xrm/2011/Contracts">
  <ErrorCode>-2147220970</ErrorCode>
  <ErrorDetails xmlns:d2p1="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
  <Message>The parent id is missing.</Message>
  <Timestamp>2012-03-27T13:26:50.6738765Z</Timestamp>
  <InnerFault i:nil="true" />
  <TraceText>
[ClassLibrary7: CreateSalesOrder.Order]
[64e3abde-0978-e111-af6d-000c29c05d09: CreateSalesOrder.Order: Update of new_zayavka]
Order: System.ServiceModel.FaultException`1[Microsoft.Xrm.Sdk.OrganizationServiceFault]: The parent id is missing. (     Microsoft.Xrm.Sdk.OrganizationServiceFault).
</TraceText>
</OrganizationServiceFault>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Xrm.Sdk.Query;
using System.ServiceModel;
using System.ServiceModel.Description;

namespace CreateSalesOrder
{
    public class Order : IPlugin
    {
          public void Execute(IServiceProvider serviceProvider)
        {
            ITracingService tracingService =
               (ITracingService)serviceProvider.GetService(typeof(ITracingService));
            try
            {
                IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));
                Entity record = (Entity)context.InputParameters["Target"];

                if (record.LogicalName == "new_zayavka")
                {
                    record["new_inn"] = "sdf";
                    record["new_name_nai"] = record["new_inn"];

                   Entity pricelevel = new Entity("pricelevel");
                   Entity currency = new Entity("transactioncurrency");
                   Entity account = new Entity("account");

                   bool vispricelocked = false;

                   Entity salesorder = new Entity("salesorder");
                   salesorder["name"] = "TEST";
                   salesorder["pricelevelid"] = new EntityReference(pricelevel.LogicalName, new Guid("156ABFBD-3704-DF11-9297-005056C00008"));
                   salesorder["transactioncurrencyid"] = new EntityReference(currency.LogicalName, new Guid("9E79B15D-1937-E111-A8B6-08002739EA86"));
                   salesorder["customerid"] = new EntityReference(account.LogicalName, new Guid("46053320-E952-E111-81DB-000C29C05D09"));
           
                   salesorder["ispricelocked"] = vispricelocked;
             
                    
           // Obtain the organization service reference.
                    IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
                    IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
                    service.Create(salesorder);

                                           
                    Guid id_1 = new Guid(salesorder["salesorderid"].ToString());
                                        
                    Entity salesorderdetail = new Entity("salesorderdetail");
                  
                    salesorderdetail["new_orda"] = new EntityReference("salesorder", id_1);
                    Entity product = new Entity("product");
                    Entity uom = new Entity("uom");
                    salesorderdetail["productid"] = new EntityReference(product.LogicalName, new Guid("AC341411-4347-E111-9250-000C29C05D09"));
                    salesorderdetail["uomid"] = new EntityReference(uom.LogicalName, new Guid("5D15C954-A08E-DB11-934C-000E0C6AB271"));

                    IOrganizationServiceFactory serviceFactory1 = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
                    IOrganizationService service1 = serviceFactory1.CreateOrganizationService(context.UserId);
                    service1.Create(salesorderdetail);
                  
                }
            }
            catch (Exception ex)
            {
                tracingService.Trace("Order: {0}", ex.ToString());
                throw;
            }
        }
    }
}