b) An entity shall account for the contract modification as if it were a part
of the existing contract if the remaining goods or services are not
distinct and, therefore, form part of a single performance obligation that
is partially satisfied at the date of the contract modification. The effect
that the contract modification has on the transaction price, and on the
entity’s measure of progress towards complete satisfaction of the
performance obligation, is recognised as an adjustment to revenue
IFRS 15 REVENUE FROM CONTRACTS WITH CUSTOMERS
_ IFRS Foundation 14
(either as an increase in or a reduction of revenue) at the date of the
contract modification (ie the adjustment to revenue is made on a
cumulative catch-up basis).