Kernrechtsfrage
Whether the appeal was admissible under Art. 43a OG despite the res judicata objection
Extrahierter Entscheid
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.
Extrahierte Begründung
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.