Tennessee Code Title 9. Public Finances § 9-11-118

(a) Any holder of bonds issued under this chapter, or any person or officer being a party in interest, may either at law or in equity by suit, action or mandamus, enforce and compel the performance of the duties required by this chapter of the governing body or any board or officer of the unit.

(b) Inasmuch as the purpose of this chapter is to place and maintain the fiscal affairs of the counties and cities in the state on a cash basis, this chapter shall constitute an irrepealable contract with the holders of bonds issued under this chapter.