Questione giuridica chiave
Whether the earlier cantonal judgment in another case created res judicata on the settlement's validity against A.
Decisione estratta
No. The earlier judgment bound only its parties and did not have third-party res judicata effect against A, who was not a party there.
Motivazione estratta
Material res judicata generally binds only parties and their successors. The earlier dispositive part did not decide the settlement vis-à-vis A, and the reasons alone had no binding effect in a different dispute.