Oregon Revised Statutes Procedure in Civil Proceedings § 20.077

(1) In any action or suit in which one or more claims are asserted for which an award of attorney fees is either authorized or required, the prevailing party on each claim shall be determined as provided in this section. The provisions of this section apply to all proceedings in the action or suit, including arbitration, trial and appeal.

(2) For the purposes of making an award of attorney fees on a claim, the prevailing party is the party who receives a favorable judgment or arbitration award on the claim. If more than one claim is made in an action or suit for which an award of attorney fees is either authorized or required, the court or arbitrator shall:

(3) Notwithstanding subsection (2) of this section, upon appeal of a judgment in an action or suit in which one or more claims are asserted for which the prevailing party may receive an award of attorney fees, the appellate court in its discretion may designate as the prevailing party a party who obtains a substantial modification of the judgment.

(4) This section does not create a claim to an award of attorney fees in any action or suit in which the court or arbitrator is not otherwise authorized or required to make an award of attorney fees by contract or other law.