Question juridique clé
Whether the arrested claim had already ceased to exist because of set-off at the time of the arrest execution.
Solution extraite
No. Set-off requires a declaration of intent communicated to the creditor; filing the arrest request is not such a declaration and cannot simultaneously express the opposite intent of preserving the claim as an arrest object.
Motifs extraits
Under Art. 138 OR, set-off only occurs when the debtor declares to the creditor that he is exercising the right of set-off. The arrest request was made to secure a specific asset and presupposes the asset's existence; it cannot be interpreted as a declaration to extinguish that same asset.