Oregon Revised Statutes Occupations and Professions § 671.575

(1) A landscape contracting business may not file a lien, file a claim with the State Landscape Contractors Board or bring or maintain in any court of this state a suit or action for compensation for the performance of any work or for the breach of any contract for work that is subject to ORS 671.510 to 671.760 and 671.997, unless the landscape contracting business was:

(2) If the court determines that the landscape contracting business was not aware of the requirement that the business be licensed, a court may choose not to apply subsection (1) of this section if the court finds that to do so would result in a substantial injustice to the unlicensed landscape contracting business.

(3) If a landscape contracting business falsely swears to information provided under ORS 671.560 or 671.565 or knowingly violates the provisions of ORS 656.029, 670.600, 671.560 or 671.565, the landscape contracting business may not file a lien, file a claim with the State Landscape Contractors Board or bring or maintain in any court of this state a suit or action for compensation for the performance of any work or for the breach of any contract for work that is subject to ORS 671.510 to 671.760 and 671.997.