gistfile1.cs

		public override Shipment_Item Shipment_Item
		{
			get
			{
				return base.Shipment_Item;
			}
			set
			{
				if (base.Shipment_Item == value) return;

				if (base.Shipment_Item != null && base.Shipment_Item.ItemPayments.Contains(this)) 
				{
					base.Shipment_Item.RemoveItemPayment(this);
				}
				base.Shipment_Item = value;
				if(value != null && !value.ItemPayments.Contains(this))
				{
					value.AddItemPayment(this);
				}
			}
		}