Oregon Revised Statutes Public Financial Administration § 294.100

(1) It is unlawful for any public official to expend any moneys in excess of the amounts provided by law, or for any other or different purpose than provided by law.

(2) Any public official who expends any public moneys in excess of the amounts or for any other or different purpose than authorized by law shall be civilly liable for the return of the money by suit of the district attorney of the district in which the offense is committed, or at the suit of any taxpayer of such district, if the expenditure constitutes malfeasance in office or willful or wanton neglect of duty.

(3) On the demand in writing of 10 taxpayers of any municipal corporation with a population exceeding 100,000 inhabitants, filed with the tax supervising and conservation commission in the county in which the municipal corporation is situated, which demand sets forth that a public official has unlawfully expended public moneys in excess of the amount or for any other or different purpose than provided by law and that the expenditure constitutes malfeasance in office or willful or wanton neglect of duty, the tax supervising and conservation commission shall make an investigation of the facts as to the expenditure. If the tax supervising and conservation commission finds that public moneys have been unlawfully expended and that the expenditure constitutes malfeasance in office or willful or wanton neglect of duty, the commission shall proceed at law in the courts against the public official who has unlawfully expended the moneys for the return of the moneys unlawfully expended to the treasury of the municipal corporation. A right of action hereby is granted to the tax supervising and conservation commission for the purposes of this section.

(4) This section does not apply to the expenditure of revenues that are allowed to be accrued from a fiscal year to the prior fiscal year under ORS 294.383.