ORS 72A.5140: Waiver of lessee’s objections.

(1) In rejecting goods, a lessee’s failure to state a particular defect that is ascertainable by reasonable inspection precludes the lessee from relying on the defect to justify rejection or to establish default:

      (a) If, stated seasonably, the lessor or the supplier could have cured it under ORS 72A.5130; or

      (b) Between merchants if the lessor or the supplier after rejection has made a request, in writing, for a full and final written statement of all defects on which the lessee proposes to rely.

      (2) A lessee’s failure to reserve rights when paying rent or other consideration against documents precludes recovery of the payment for defects apparent in the documents.