In section 78 of the Income-tax Act, for sub-section (1), the following sub-section shall be substituted, with effect from the 1st day of April, 1993, namely :-
"(1) Where a change has occurred in the constitution of a firm, nothing in this Chapter shall entitle the firm to have carried forward and set off so much of the loss proportionate to the share of a retired or deceased partner as exceeds his share of profits, if any, in the firm in respect of the previous year."