Oregon Revised Statutes Property Rights and Transactions § 105.123

(1) A description of the premises with convenient certainty;

(2) That the defendant is in possession of the premises;

(3) That, in the case of a dwelling unit to which ORS chapter 90 does not apply, the defendant entered upon the premises with force or unlawfully holds the premises with force; and

(4) That the plaintiff is entitled to the possession of the premises.