engaging in any prohibited transaction as defined in Section 406 of ERISA or Section 4975 of the Code; (I) in accordance with Section 9.12, provided that such action does not cause any BHC Partner to violate the BHC Act; and (J) to make any changes that, in the reasonable opinion of the General Partner, will have no material adverse effect on the Limited Partners or on the Partnership, provided that that the Advisory Committee has approved such amendment (which approval shall not be unreasonably withheld). (b) There shall be no amendment to Sections 8.1 or 8.2 unless such amendment is approved by the General Partner and Limited Partners holding at least 80% of the Limited Partners' Voting Interests. (c) No amendment that alters the definitions of BHC Partner, BHC Act, IB Act, Non-Voting Interest, or Voting Interest or the provisions of Sections 7.2(g), 11.8 or this 20.1(c) or, or that would adversely affect the BHC Partners relative to other Limited Partners shall be permitted without the consent of each BHC Partner. (d) No amendment that alters the definition of Foundation Partner, the references to Section 509 of the Code or Subchapter A of Chapter 42 of the Code or the provisions of Sections 7.2(i), 12.5 or this 20.1(d), or that would adversely affect the Foundation Partners relative to other Limited Partners shall be permitted without the consent of each Foundation Partner. (e) No amendment that alters the definitions of ERISA Partner or ERISA or the provisions of Sections 7.2(h), 8.3(b)(iv), 9.12, 12.4 or this 20.1(e), or that would adversely affect the ERISA Partners