Oregon Revised Statutes Probate Law § 115.135

(1) A claim presented to the personal representative shall be considered allowed as presented unless within 60 days after the date of presentment of the claim the personal representative mails or delivers a notice of disallowance of the claim in whole or in part to the claimant and, if any, the attorney of the claimant. The personal representative shall file in the estate proceeding the claim as presented and a copy of the notice of disallowance.

(2) A notice of disallowance of a claim shall inform the claimant that the claim has been disallowed in whole or in part and, to the extent disallowed, will be barred unless the claimant proceeds as provided in ORS 115.145.

(3) The personal representative may rescind the previous allowance of an unpaid claim, if the claim was allowed because of error, misinformation or excusable neglect. Not less than 30 days before the date of the filing of the final account the personal representative shall give notice of rescission of previous allowance of a claim to the claimant and, if any, the attorney of the claimant in the same manner and containing the same information as a notice of disallowance.