638.2. A taxpayer who pays an amount at any time in a taxation year is deemed to have a capital loss from a disposition of property for the year if(a) the taxpayer disposed of an interest in a partnership before that time or, because of section 636, acquired before that time a right to receive property of a partnership;
(b) that time is after the disposition or acquisition;
(c) the amount would have been described in subparagraph i of paragraph i of section 255 had the taxpayer been a member of the partnership at that time; and
(d) the amount is paid pursuant to a legal obligation of the taxpayer to pay the amount.