Minn. Stat. § 441.54: BONDS NOT INDEBTEDNESS OF CITY.

All bonds issued under sections 441.47 to 441.55 shall be exempt from and shall not constitute an indebtedness of any such city within the meaning of any provisions contained in the charter of the city or in any law of the state prescribing, limiting, or fixing the time and manner of payment of municipal bonds or prescribing, limiting, or fixing the time and manner of sale of municipal bonds, and all such bonds may be authorized, issued, and sold by any such city as provided in sections 441.47 to 441.55 notwithstanding any such charter or statutory provision.