private void detach_InvoiceLines(InvoiceLine entity)
		{
			this.SendPropertyChanging();
			entity.Invoice = null;
		}
		private void attach_InvoiceLines(InvoiceLine entity)
		{
			this.SendPropertyChanging();
			entity.Invoice = this;
		}
 partial void UpdateInvoiceLine(InvoiceLine instance);
 partial void DeleteInvoiceLine(InvoiceLine instance);
 partial void InsertInvoiceLine(InvoiceLine instance);