Kernrechtsfrage
Whether the cantonal court could require written proof of B.'s authority to represent the company in formation.
Extrahierter Entscheid
Yes. In case of doubt about the legal existence of a legal person and the representative's powers, the authority may require written proof and set a short deadline, failing which the filing may be treated as withdrawn.
Extrahierte Begründung
The cantonal procedure rules on collaboration and proof of authority were not applied arbitrarily; the appellants did not show excess formalism or any unbearable result, and the request for documents was justified by contradictory information about the company's registration.