671.7. Where a designated trust, in its fiscal return for a taxation year under Part I of the Income Tax Act (Revised Statutes of Canada, 1985, chapter 1, 5th Supplement), in accordance with subsection 13.1 or 13.2 of section 104 of that Act, designates an amount in respect of a beneficiary under the designated trust who is a designated beneficiary for the year or a partnership at least one member of which is a designated beneficiary for the year, the presumption in the first paragraph of section 663.1 or 663.2 does not apply in respect of the amount so designated in respect of that designated beneficiary or does not apply in respect of the amount that may reasonably be considered to relate to the share of the designated beneficiary who is a member of the partnership in the amount so designated in respect of that partnership.