A. Requirement
I. In general
1 A person who has enriched himself without just cause at the expense of another is obliged to make restitution.
2 In particular, restitution is owed for money benefits obtained for no valid reason whatsoever, for a reason that did not transpire or for a reason that subsequently ceased to exist.
A. Conditions
I. En général
1 Celui qui, sans cause légitime, s’est enrichi aux dépens d’autrui, est tenu à restitution.
2 La restitution est due, en particulier, de ce qui a été reçu sans cause valable, en vertu d’une cause qui ne s’est pas réalisée, ou d’une cause qui a cessé d’exister.