ORS § 545.639
The procedure in the circuit court under ORS 545.629 to 545.637 shall be in the nature of an equitable proceeding in rem. Any holder of evidences of indebtedness affected by any court procedure under ORS 545.629, 545.631, 545.633, 545.635 and 545.637, or any other interested party, may appeal to the Court of Appeals at any time within 30 days after the entry of the judgment of the circuit court. The appeal must be heard and determined within three months from the time of taking the appeal. The court, in inquiring into the regularity, legality or correctness of the proceedings, shall disregard any error, irregularity or omission that does not affect the substantial rights of the parties and may approve the proceedings in part and disapprove the remainder. The costs of the proceedings may be allowed and apportioned between the parties in the discretion of the court.
ORS 545.639