partial void Deleteyearreport_cost(yearreport_cost instance);
 partial void Updateyearreport_cost(yearreport_cost instance);
		private void detach_yearreport_costs(yearreport_cost entity)
		{
			this.SendPropertyChanging();
			entity.yearreport = null;
		}
 partial void Insertyearreport_cost(yearreport_cost instance);
		private void attach_yearreport_costs(yearreport_cost entity)
		{
			this.SendPropertyChanging();
			entity.cost = this;
		}