1. Where the recipient of an undue is acting in good faith, they shall only be bound to return what they received. If they refuse to make restitution, they shall be bound to return what they have received, together with any gains or personal benefits they have derived therefrom, as well as what they failed to derive from the thing they received, as from the date of filing the claim for restitution. 2. Where the recipient of an undue is acting in bad faith, they shall be bound to return what they received, together with any gains or personal benefits they have derived therefrom, as well as what they failed to derive from the thing they received without right, as from the date of receipt or from the day they became acting in bad faith.
Interpretation and application must be checked against the official text and current version.