The obligation becomes pure and simple as from the fulfilment of the suspensive condition.
However, the parties may provide that the fulfilment of the condition will have retroactive effect to the day of the contract. The thing, which is the subject of the obligation, nonetheless remains at the risk of the debtor, who retains administration of it and is entitled to the fruits until the condition is fulfilled.
In the event of failure of the suspensive condition, the obligation is deemed never to have existed.