The economic provisions of a final collective bargaining agreement are subject to funding by the county councils of Montgomery County and Prince George’s County. The Commission shall request funds in the Commission’s final budget from the county councils of Montgomery County and Prince George’s County for all economic provisions of a final collective bargaining agreement. If the request for funds necessary to implement the collective bargaining agreement is reduced, modified, or rejected by the county councils of Montgomery County and Prince George’s County, the Commission or the exclusive representative, within 5 days after final budget action by the county councils, shall reopen the negotiated collective bargaining agreement and bargain with respect to the provisions of the collective bargaining agreement not approved by the county councils. If a provision of a collective bargaining agreement is ruled invalid or is not funded by Montgomery County and Prince George’s County, the remainder of the collective bargaining agreement remains in effect unless reopened under subsection (b) of this section.