Cap. 16 Art. 1204Payment of a debt which was extinguished by a set-off.

A person who has paid a debt owing by him which, according to law, was extinguished by a set-off, may not in suing for the payment of the claim owing to him in respect of which he failed to plead the set-off, enforce, to the prejudice of third parties, any privilege, hypothec or other security attached to his claim, unless he had good grounds for not being aware of the claim which would have set off his debt.

§ V.OF MERGER