Oregon Revised Statutes Agricultural Marketing and Warehousing § 586.350

(1) Directly or indirectly, by any special charge, rebate, drawback or other device, demand, collect or receive from any person a greater or lesser compensation for any service rendered or to be rendered in the handling or storage of grain than the warehouseman demands, collects or receives from any other person for doing for the person a like and contemporaneous service in the handling or storage of grain under substantially similar circumstances or conditions.

(2) Make or give any undue or unreasonable preference or advantage to any person in any respect whatsoever.

(3) Subject any particular person to any undue or unreasonable prejudice or disadvantage in any respect whatsoever.