No changes in the official zoning map shall be made except as may be required by amendments to the Zoning Code under Section 168.16 of this Code of Ordinances. If required, such changes shall be promptly made and the ordinance number, nature of change, and date of change shall be noted on the map, approving such change in the official zoning map. Any unauthorized change of any kind whatsoever in the official zoning map by any person or persons shall constitute a violation of this Zoning Code.