(IAS19.96)
In cases where benefits have already vested, an entity shall recognise the related past service cost immediately.
In cases where vesting is not immediate, an entity shall recognise the related past service cost as an expense on a straight-line basis over the average period until the benefits become vested.
(Revised standard IAS 19. 103)
An entity shall recognise past service cost as an expense at the earlier of the following dates:
a) when the plan amendment or curtailment occurs; and
b) when the entity recognises related restructuring costs termination benefits.