Question juridique clé
Whether the appeal was admissible under Art. 43a OG despite the res judicata objection
Solution extraite
The appeal was admissible because the claim was based on Swiss law; the complaint concerned the federal principle of res judicata, not the application of foreign law.
Motifs extraits
The contractual claim arose from a mandate governed by Swiss law absent a choice of law, so the prior-judgment effect had to be assessed under Swiss law.