Notwithstanding the rights granted employee organizations pursuant to Subtitles 5, 7, and 8 of <cite data-path="|12">this article</cite>, an employee organization certified as representative of employees in a unit consisting of professional and/or supervisory employees is limited in its rights hereunder only to meet and confer concerning wages, hours, and working conditions and reduce the results of such negotiations to a memorandum of understanding. The provisions of this section shall not apply to employee organizations representing fire officers and registered nurses. City Code, 1976/83, art. 1, §137 Ord. 72-231