Understandings reached between an employee organization which is the exclusive representative of employees in an appropriate unit and the employer may contain provisions concerning procedures for consideration and resolution of grievances by binding arbitration. Provided, however, that if binding arbitration of a particular grievance would be contrary to any of the provisions of <cite data-doc="City of Baltimore, Md., Charter">the Baltimore City Charter</cite>, the decision of any arbitrator shall not be final and binding on the parties but shall be advisory only. City Code, 1976/83, art. 1, §132(1st sen.) Ord. 68-251 Ord. 72-241