ORS 135.640: When objections that are grounds for demurrer may be taken.

When the objections mentioned in ORS 135.630 appear upon the face of the accusatory instrument, they can only be taken by demurrer, except that the objection to the jurisdiction of the court over the subject of the accusatory instrument, or that the facts stated do not constitute an offense, may be taken at the trial, under the plea of not guilty and in arrest of judgment.