private void detach_itemDocs(itemDoc entity)
		{
			this.SendPropertyChanging();
			entity.document = null;
		}
		private void attach_itemDocs(itemDoc entity)
		{
			this.SendPropertyChanging();
			entity.document = this;
		}
 partial void UpdateitemDoc(itemDoc instance);
 partial void DeleteitemDoc(itemDoc instance);
 partial void InsertitemDoc(itemDoc instance);