Wisconsin Administrative Code
Employment Relations Commission
ERC 30-39 - Municipal Sector Interest Dispute Resolution Processes
Chapter ERC 30 - Municipal interest arbitration involving fire fighting and law enforcement personnel under s. 111.77, Stats
Section ERC 30.10 - Procedure for raising objection that a proposal is a non-mandatory subject of bargaining

(a) During negotiations, mediation or investigation. Should either party assert, during negotiations or during commission mediation or investigation, that a proposal by the other party is a non-mandatory subject of bargaining, either party may commence a declaratory ruling proceeding before the commission under s. 111.70(4) (b), Stats., and s. ERC 30.11

(b) After call for final offers. Should either party assert, after the commission or investigator calls for the parties to exchange proposed final offers and before the close of the informal investigation or formal hearing, that a proposal by the other party is a non-mandatory subject of bargaining, the commission or investigator shall not close the investigation or hearing, but shall direct in writing the objecting party to reduce the objection to writing by commencing, within a reasonable time determined by the commission or investigator, a declaratory ruling proceeding before the commission under s. 111.70(4) (b), Stats., and s. ERC 30.11.