If the assignee has recourse against the assignor for the warranty under Articles (411) and (412), the assignor is only liable to return what they received along with expenses, even if otherwise agreed. However, the assignor shall be liable, if they knew of the non-existence of the right in the debtor's liability, to compensate the bona fide assignee for the damage they have suffered.
Interpretation and application must be checked against the official text and current version.