Oregon Revised Statutes Public Financial Administration § 294.670

(1) The commission may inquire into the management, books of account and systems employed, of each municipal corporation, and of each department thereof within its respective county.

(2) Notwithstanding ORS 294.495 (2), the commission may prescribe such rules and regulations as are considered proper to effectually carry out the purposes of ORS 294.305 to 294.705. In any case where rules adopted pursuant to this subsection conflict with rules adopted by the Department of Revenue, rules adopted by the department shall prevail.