Oregon Revised Statutes Public Officers and Employees § 243.752

(1) A majority decision of the arbitration panel, under ORS 243.706, 243.726, 243.736, 243.742 and 243.746, if supported by competent, material and substantial evidence on the whole record, based upon the factors set forth in ORS 243.746 (4), shall be final and binding upon the parties. Refusal or failure to comply with any provision of a final and binding arbitration award is an unfair labor practice. Any order issued by the Employment Relations Board pursuant to this section may be enforced at the instance of either party or the board in the circuit court for the county in which the dispute arose.

(2) The arbitration panel may award increases retroactively to the first day after the expiration of the immediately preceding collective bargaining agreement. At any time the parties, by stipulation, may amend or modify an award of arbitration.