3Ten pointed out that
- No action shall be taken (apart from audio warning cancel) until:
* The appropriate flight path is stabilized
* Normal procedures are applied
* At least 400 feet above the runway, in case of failure during approach, take off or go around,
So as this is a landing you can initiate action straight away.
What should happen is that one of the pilots will read out the ECAM message as soon as it occurs; it's significance will be recognised and the corrective action to sort out the flight path can be taken immediately.
Tyro