§ 554. Consistent provisions. Any other provisions of this chapter relating to mandatory contribution to the retirement system based upon a member's date of membership in such system shall not be deemed to be affected by the provisions of this article, and any member who on the date this article takes effect is not required to contribute shall not be required to make any contributions as a result of the enactment of this article. For those members required to contribute to the retirement system, such contribution shall be treated in the same manner as specified for such members in article fourteen or article fifteen of this chapter.