excess benefit, unless the participation of the organization in the excess benefit transaction is not willful and is due to reasonable cause. . (b) Minimum standards of organization due diligence Subsection (d) of section 4958 is amended by adding at the end the following new paragraph: (3) Minimum standards of organization due diligence (A) In general Subsection (a)(3) shall not apply to a transaction, if— (i) the organization establishes that the minimum standards of due diligence described in subparagraph (B) were met with respect to the transaction, or (ii) the organization establishes to the satisfaction of the Secretary that other reasonable procedures were used to ensure that no excess benefit was provided. (B) Minimum standards An organization shall be treated as satisfying the minimum standards of due diligence described in this subparagraph with respect to any transaction, if— (i) the transaction was approved in advance by an authorized body of the organization composed entirely of individuals who did not have a conflict of interest with respect to the transaction, (ii) the authorized body obtained and relied upon appropriate data as to comparability prior to approval of the transaction, and (iii) the authorized body adequately and concurrently documented the basis for approving the transaction. (C) No presumption as to reasonableness Meeting the requirements of clause (i) or (ii) of subparagraph (A) with respect to a transaction shall not give rise to a presumption of reasonableness for purposes of the taxes imposed by paragraphs (1) of (2) of subsection (a) and shall not, by itself, support a conclusion that a manager did not act knowingly for purposes of subsection (a)(2) or that the organization did not act wilfully or without reasonable cause for purposes of subsection (a)(3). . (c) Repeal of exception for manager reliance on professional advice Section 4958 is amended by adding at the end the following new subsection: (g) No safe harbor for reliance on professional advice An organization