Kernrechtsfrage
Whether the federal appeal could challenge the cantonal ruling that the lawyer lacked authority to act for the tenant and heirs.
Extrahierter Entscheid
No. The decisive reasoning rested on cantonal procedural law governing external powers of representation; the federal reform appeal could not attack that reasoning, and the subsidiary federal-law reasoning on negotiorum gestio was also not reviewable in this procedural posture.
Extrahierte Begründung
The Court distinguished internal mandate relations from external representation before the court. External authority is governed by procedural law; in cantonal proceedings, cantonal procedure applies. Because the appellant failed to attack the independent cantonal-law ground with the proper remedy, the appeal was inadmissible in its entirety.