Nothing in this section shall prohibit or impair the adoption by any contract market, derivatives transaction execution facility, or by any other board of trade licensed, designated, or registered by the Commission or by any electronic trading facility of any bylaw, rule, regulation, or resolution fixing limits on the amount of trading which may be done or positions which may be held by any person under contracts of sale of any commodity for future delivery traded on or subject to the rules of such contract market or derivatives transaction execution facility or on an electronic trading facility, or under options on such contracts or commodities traded on or subject to the rules of such contract market, derivatives transaction execution facility, or electronic trading facility or such board of trade: Provided, That if the Commission shall have fixed limits under this section for any contract or under section
6c of this title for any commodity option, then the limits fixed by the bylaws, rules, regulations, and resolutions adopted by such contract market, derivatives transaction execution facility, or electronic trading facility or such board of trade shall not be higher than the limits fixed by the Commission. It shall be a violation of this chapter for any person to violate any bylaw, rule, regulation, or resolution of any contract market, derivatives transaction execution facility, or other board of trade licensed, designated, or registered by the Commission or electronic trading facility with respect to a significant price discovery contract fixing limits on the amount of trading which may be done or positions which may be held by any person under contracts of sale of any commodity for future delivery or under options on such contracts or commodities, if such bylaw, rule, regulation, or resolution has been approved by the Commission or certified by a registered entity pursuant to section
7a–2
(c)(1) of this title: Provided, That the provisions of section
13
(a)(5) of this title shall apply only to those who knowingly violate such limits.