null Amount value salesorderdetail on crm 2011-Silverlight

Question

I'm trying to insert data on SalesOrderDetail entity, everything works fine, except for the Amount field which remains null. I don't get any error message. Here is an example of my code :

private void beginCreateSalesOrderDetail()
{
    SalesOrderDetail orderDetail = new SalesOrderDetail();
    orderDetail.SalesOrderId = new EntityReference() 
    { 
       Id = id, 
       LogicalName = "salesorder" 
    };
    orderDetail.Quantity = element.QuantityOnHand;
    orderDetail.ProductId = new EntityReference() 
    { 
        Id = element.ProductId, 
        LogicalName = "product" 
    };
    orderDetail.UoMId = new EntityReference() 
    { 
        Id = new Guid("8DDD2AFB-73CF-E111-8140-00155D55B216"),        
        LogicalName = "uom" 
    };
    orderDetail.TransactionCurrencyId = new EntityReference() 
    { 
        Id = new Guid("77D695B5-ACB4-E111-97BC-00155D55B216"), 
        LogicalName = "transactioncurrency" 
    };

    Money Taxe = new Money(); 
    Money Amount = new Money();
    Taxe.Value = Convert.ToDecimal(element.totalCharges);
    Amount.Value = Convert.ToDecimal(InvoiceTotal);
    orderDetail.Tax = Taxe;
    orderDetail.BaseAmount = Amount;
    orderDetail.PricePerUnit = element.Price;
    orderDetail.Description = element.PDesc;
   _context.AddToSalesOrderDetailSet(orderDetail);
 _context.BeginSaveChanges(EndCreateSalesOrderDetail, orderDetail);

}



private void EndCreateSalesOrderDetail(IAsyncResult result)
  {

     try
     {
       _context.EndSaveChanges(result);
     }
            catch (Exception ex)
            {
            }

   }    

Please note that only the amount which remains null

Answer 1

I get the solution. Actually, there is a restrictions in crm 2011 to calcul the amounts of products, We have to create a Price List, and associate each product in the list. Thank you.