If the transferred asset is part of a larger financial asset (eg when an
entity transfers interest cash flows that are part of a debt instrument, see
paragraph 3.2.2(a)) and the part transferred qualifies for derecognition in
its entirety, the previous carrying amount of the larger financial asset
shall be allocated between the part that continues to be recognised and
the part that is derecognised, on the basis of the relative fair values of
those parts on the date of the transfer. For this purpose, a retained
servicing asset shall be treated as a part that continues to be recognised.