Act Governing Relations with Hong Kong and Macau Article 7

Institutions that have been established or designated as well as non-governmental organizations that have been commissioned in accordance with the preceding article shall not enter into any agreement in any form with the Hong Kong or Macau government, or their respective authorized non-governmental organizations, without prior authorization of the Competent Authority.
中文原文 香港澳門關係條例第7條
依前條設立或指定之機構或受託之民間團體,非經主管機關授權,不得與香港或澳門政府或其授權之民間團體訂定任何形式之協議。

English translation for reference only; the Chinese text prevails. Not legal advice.