Montana Title 19. Public Retirement Systems § 19-20-1214. Costs and fees for recovering amounts owed

(1) Unless an overpayment or unpaid contributions resulted solely from an error of the retirement system, in any contested case or other civil proceeding for correction of an error or recovery of an overpayment or unpaid contributions, the retirement system is entitled to the costs enumerated in 25-10-201 and to reasonable attorney fees if:

(2) If there are multiple parties adverse to the retirement system in a contested case, the parties are jointly and severally liable for the costs and fees awarded to the retirement system.