Section 3
SEC. 3. The parties to any dispute, grievance or issue shall first exhaust all steps in the grievance procedure provided for in the applicable collective bargaining agreement or such other means of dispute settlement mutually agreed upon by them before either or both parties may raise an issue, dispute or grievance to the Commission. The complaining party will be required to show proofs of failure to settle the issue, dispute or grievance under the procedure agreed upon by the parties.