Any provision of services including the execution of real estate work, whether or not accompanied by a sale, supplied to private individuals by a person liable for value added tax, must be the subject of a note stating the name and address of the parties, the nature and date of the operation carried out, the amount of its price and the amount of value added tax. The original of the note is returned to the customer at the latest when the balance of the price is paid; the duplicate is kept by the service provider within the limits of the administration’s right of recovery.