ORS 293.326: When claim allowed against state as setoff.

In an action or suit brought in behalf of the state, a claim may not be allowed against the state as a setoff unless:

      (1) The claim was presented to the Oregon Department of Administrative Services or the state agency that incurred the obligation or made the expenditure on which the claim is based, and approved or disapproved as provided by law; or

      (2) It is proved to the satisfaction of the court that the defendant, at the time of trial, is in possession of evidence in support of the claim that the defendant could not present to the department or state agency because of absence from the state, sickness or unavoidable accident.