Neb. Rev. Stat. § 25-2005: Neb. Rev. Stat. § 25-2005

A judgment shall not be vacated on motion or complaint, until it is adjudged that there is a valid defense to the action in which the judgment is rendered, or, if the plaintiff seeks its vacation, that there is a valid cause of action; and when a judgment is modified, all liens and securities obtained under it shall be preserved to the modified judgment.