Kernrechtsfrage
Whether the public law appeal was admissible despite the subsidiarity of that remedy.
Extrahierter Entscheid
The appeal was admissible only within the limits stated by the Federal Tribunal; the burden-of-proof complaint was inadmissible because it belonged to a reform appeal.
Extrahierte Begründung
A violation of the burden of proof under federal law is to be raised by reform appeal when available; because that remedy was open, the public law appeal was subsidiary and could not be used for that complaint.