partial void DeleteSI(SI instance);
 partial void UpdateSI(SI instance);
		private void detach_SIs(SI entity)
		{
			this.SendPropertyChanging();
			entity.Year = null;
		}
 partial void InsertSI(SI instance);
		private void attach_SIs(SI entity)
		{
			this.SendPropertyChanging();
			entity.Year = this;
		}