Neb. Rev. Stat. § 52-1103

In order to be valid against subsequent lienholders, any lien created under section 52-1101 shall be filed within one hundred twenty days after the last date upon which the product, machinery, or equipment was furnished or work or labor was performed under the contract, but in no event shall it have priority over prior lienholders unless prior lienholders have agreed to the contract in writing. Such lien shall attach as of the date of filing. Such lien shall be treated in all respects as an agricultural lien as provided in article 9, Uniform Commercial Code, and may be enforced in the manner and form provided for the enforcement of secured transactions as provided in article 9, Uniform Commercial Code. Effective January 1, 2015, this section applies to a lien created under section 52-1101 regardless of when the lien was created.