Notwithstanding the provisions of the preceding paragraph, the provisions then in force continue to govern, among distributions of proceeds from Securities Investment Trusts prescribed in Article 11, paragraph (1) of the new Income Tax Act which a Domestic Corporation or Foreign Corporation, or a charitable trust, prescribed in the preceding paragraph is to receive on or after April 1, 1989 and which correspond to a calculation period for those distributions of proceeds that includes that date, the part of those distributions of proceeds equivalent to the amount calculated pursuant to Cabinet Order as the amount corresponding to the period from the first day of that calculation period to March 31, 1989.