Clarification of bargaining units.

(1) A petition to clarify the composition of a bargaining unit may be filed with the commission when significant changes in statutory law or case law require clarification of the bargaining unit or when a classification was:

(a) Created or substantially changed after the unit was initially defined by the commission;

(b) Retitled with no substantial change in job duties; or

(c) Included or excluded through inadvertence or misunderstanding by the commission.

(2) A bargaining unit clarification petition may be filed by the bargaining agent for the bargaining unit or by the public employer of the public employees in the unit.

(3) A copy of the petition must be served on the public employer and any bargaining agent that is certified to represent any employee or classification which may be substantially affected by the proposed bargaining unit clarification.

(4) If any substantially affected employees are not represented by a bargaining agent, the public employer must provide a copy of the petition to those employees within 10 days after the filing of the petition.

(5) When the clarification of a bargaining unit would result in an increase in the size of the bargaining unit by more than 25 percent, the unit clarification petition raises a question concerning representation and must be dismissed.