Oregon Revised Statutes Public Officers and Employees § 240.167

(1) The administrative expenses and costs of operation of the Employment Relations Board in behalf of the state service shall be paid by the various divisions of the service in the state government. The board shall determine the amount of the expenses and costs to be paid by each division of the service on the basis of the proportion that the number of employees of that division in the classified service bears to the total number of employees of all divisions of the service in the classified service, or on any other basis that the board determines to be equitable.

(2) The Employment Relations Board, at such times as its executive secretary considers proper, shall estimate in advance the expenses and costs that will be incurred during a period of not to exceed six months and shall render to each division of the service in the state government affected thereby an invoice for its pro rata share of such expenses and costs. Each division shall pay such invoice promptly as an administrative expense of that division from funds appropriated to or otherwise available for expenditure by that division, in the same manner as other claims against the state are paid. If the estimated expenses in the case of any division are more or less than the actual expenses, the difference shall be reflected in the next following estimate of expenses and invoice for that division of the service.