Section 1024.4 - Reliance upon rule, regulation, or interpretation by the Bureau(a)Rule, regulation or interpretation.(1) For purposes of sections 19(a) and (b) of RESPA (12 U.S.C. 2617(a) and (b) ), only the following constitute a rule, regulation or interpretation of the Bureau: (i) All provisions, including appendices and supplements, of this part. Any other document referred to in this part is not incorporated in this part unless it is specifically set out in this part;(ii) Any other document that is published in the FEDERAL REGISTER by the Bureau and states that it is an "interpretation," "interpretive rule," "commentary," or a "statement of policy" for purposes of section 19(a) of RESPA. Except in unusual circumstances, interpretations will not be issued separately but will be incorporated in an official interpretation to this part, which will be amended periodically.(2) A "rule, regulation, or interpretation thereof by the Bureau" for purposes of section 19(b) of RESPA (12 U.S.C. 2617(b) ) shall not include the special information booklet prescribed by the Bureau or any other statement or issuance, whether oral or written, by an officer or representative of the Bureau, letter or memorandum by the Director, General Counsel, or other officer or employee of the Bureau, preamble to a regulation or other issuance of the Bureau, Public Guidance Document, report to Congress, pleading, affidavit or other document in litigation, pamphlet, handbook, guide, telegraphic communication, explanation, instructions to forms, speech or other material of any nature which is not specifically included in paragraph (a)(1) of this section.(b) All informal counsel's opinions and staff interpretations issued by HUD before November 2, 1992, were withdrawn as of that date. Courts and administrative agencies, however, may use previous opinions to determine the validity of conduct under the previous Regulation X. 76 FR 78981 , Dec. 20, 2011, as amended at 78 FR 10874 , Feb. 14, 2013