No fiduciary shall cause any assets of a plan to be invested in any covered entity (as defined in section 12(d)(4)(B) of the Investment Company Act of 1940 ( 15 U.S.C. 80a–12(d)(4)(B) )). . (4) Effective date (A) In general Except as provided in subparagraph (B), the amendments made by this subsection shall apply to plan years beginning after the date which is 180 days after the date of the enactment of this Act. (B) Plan amendments If subparagraph (C) applies to any retirement plan or contract amendment— (i) such plan or contract shall not fail to be treated as being operated in accordance with the terms of the plan during the period described in subparagraph (C)(ii) solely because the plan operates in accordance with the amendments made by this subsection, and (ii) except as provided by the Secretary of the Treasury (or the Secretary’s delegate), such plan or contract shall not fail to meet the requirements of the Internal Revenue Code of 1986 or the Employee Retirement Income Security Act of 1974 by reason of such amendment. (C) Amendments to which paragraph applies (i) In general This paragraph shall apply to any amendment to any plan or annuity contract which— (I) is made pursuant to the provisions of this section, and (II) is made on or before the last day of the first plan year beginning on or after the date which is 2 years after the date of the enactment of this Act (4 years after such date of enactment, in the case of a governmental plan). (ii) Conditions This paragraph shall not apply to any amendment unless— (I) during the period beginning on the date which is 180 days after the date of the enactment of this Act, and ending on the date described in clause (i)(II) (or, if earlier, the date the plan or contract amendment is adopted), the plan or contract is operated as if such plan or contract amendment were in effect, and (II) such plan or contract amendment applies retroactively for such period. (D) Subsequent amendments Rules similar to the rules of subparagraphs (B) and (C) shall apply in the case