Oregon Revised Statutes Public Financial Administration § 294.463

(1) Except as provided in subsection (2) of this section, transfers of appropriations may be made within a fund when authorized by ordinance or resolution of the governing body of a municipal corporation. The ordinance or resolution must state the need for the transfer, the purpose for the authorized expenditure and the amount transferred.

(2) Transfers of general operating contingency appropriations that in aggregate during a fiscal year or budget period exceed 15 percent of the total appropriations of the fund contained in the original budget adopted by the governing body of the municipal corporation for the fiscal year or budget period may be made only after adoption of a supplemental budget prepared for the purpose.

(3) Transfers of appropriations or of appropriations and an equal amount of budget resources may be made between funds of the municipal corporation when authorized by ordinance or resolution of the governing body. The ordinance or resolution must state the need for the transfer, the purpose for the authorized expenditures in the appropriation and the amount transferred.

(4) This section applies only to transfers made after a budget has been approved and during the fiscal year or budget period for which the appropriations are made.