40. (1) Every notarial deed shall be closed by the signatures of the parties, of the assisting notary or of the witnesses required, as the case may be, in the presence of the officiating notary and by the latter’s signature, which must be affixed on the very day on which the last of the parties to sign did so.
(2) Any party to a notarial deed may sign it in the presence of a notary other than the officiating notary. In such case, after the signature of the party and immediately below, the notary who received it shall enter and sign an attestation that such signature was affixed before him and of the date on which it was affixed.
(3) The last signature, however, must be affixed before the officiating notary.