Oregon Revised Statutes Procedure in Civil Proceedings § 21.105

(1) The caption of any complaint or other document filed in a circuit court for the purpose of commencing an action or other civil proceeding must include a reference to the statute that establishes the filing fee for the proceeding. If the proceeding is subject to a filing fee established under ORS 21.160, the caption must indicate the amount in controversy. If the proceeding is subject to a filing fee established under ORS 21.170 or 21.180, the caption must indicate the value of the estate.

(2) If at any time a party files an amended pleading in a proceeding that is subject to a filing fee established under ORS 21.160, 21.170 or 21.180, and the pleading increases the amount in controversy or the value of the estate in the proceeding, the caption of the pleading must note that increased amount. The court shall collect an additional filing fee from the party filing the pleading that is equal to the difference between the filing fee that was paid by the party when the original pleading was filed and the filing fee that would have been collected if the amount had been pleaded in the original pleading.

(3) If at any time the court determines that a party has failed to comply with the requirements of this section, the court may require that the party pay all fees that should have been paid at the time the document was filed.