In volume 3 page 506:
In regards to classification of a finance lease under IFRS, what does this mean?
The lessee has the option to purchase the asset at a price that is expected to be sufficiently lower than the fair value at the date the option becomes exercisable for it to be reasonably certain, at the inception of the lease, that the option will be exercised.
It sounds as though they’re giving you a way to decide (at the inception of the lease) whether a bargain purchase option will likely be exercised: if the price on the option is well below the fair value of the asset. If (at inception) it’s reasonably certain that the option will be exercised (at expiration), then the lease should be classified as a finance lease.