private void detach_ItemEstornos(ItemEstorno entity)
		{
			this.SendPropertyChanging();
			entity.Venda = null;
		}
		private void attach_ItemEstornos(ItemEstorno entity)
		{
			this.SendPropertyChanging();
			entity.Venda = this;
		}
 partial void UpdateItemEstorno(ItemEstorno instance);
 partial void DeleteItemEstorno(ItemEstorno instance);
 partial void InsertItemEstorno(ItemEstorno instance);