ORS 114.620
Section 24, chapter 574, Oregon Laws 2009, provides:
Sec. 24. A written contract, agreement or waiver entered into before the effective date of this 2009 Act [January 1, 2011], whether prenuptial or post-nuptial, that waives in whole or in part the elective share of a surviving spouse is effective as a waiver under section 6 of this 2009 Act [114.620] unless a court determines that the contract, agreement or waiver is not enforceable under the standards of section 6 of this 2009 Act. Section 6 (2) of this 2009 Act applies to contracts, agreements or waivers entered into before, on or after the effective date of this 2009 Act. [2009 c. 574, § 24]