private void detach_InvoiceItems(InvoiceItem entity)
		{
			this.SendPropertyChanging();
			entity.Invoice = null;
		}
		private void attach_InvoiceItems(InvoiceItem entity)
		{
			this.SendPropertyChanging();
			entity.Invoice = this;
		}
 partial void UpdateInvoiceItem(InvoiceItem instance);
 partial void DeleteInvoiceItem(InvoiceItem instance);
 partial void InsertInvoiceItem(InvoiceItem instance);