When a judgment is reversed or set aside on a question of law arising in the justice's or city court, the district court must either try the case anew or render a judgment.
Mont. Code Ann. § 25-33-302, under Proceedings in District Court.
Mont. Code Ann. § 25-33-302
When a judgment is reversed or set aside on a question of law arising in the justice's or city court, the district court must either try the case anew or render a judgment.