Key legal question
Whether a person acting as party representative without a valid written power of attorney must bear the procedural costs caused by the filing.
Extracted holding
Yes. A representative who appears without a process-law-valid power of attorney is treated vis-à-vis the court as unauthorized and must bear the resulting court costs and any adverse-party compensation personally.
Extracted reasoning
The court held that the external capacity of a party representative is governed by procedural law, not by any informal internal mandate. If no valid authorization is produced, the representative's acts are ineffective against the purported principal; the principal cannot be charged with party costs because he never became a party. However, the unauthorized acts still trigger judicial and possibly opposing-party expenses, which should be allocated to the representative under the general principle underlying Art. 39(1) OR.