Oregon Revised Statutes Occupations and Professions § 696.845

When signing an offer to purchase, each buyer shall acknowledge the existing agency relationships, if any. When a seller accepts or rejects an offer to purchase in writing, each seller shall acknowledge the existing agency relationships, if any. An agent to the real property transaction shall obtain the signatures of the buyers and the sellers to the acknowledgment, which shall be incorporated into or attached as an addendum to the offer to purchase or to the acceptance. The Real Estate Agency shall prescribe by rule the form and content of the acknowledgment of existing agency relationships.