For descent there are the following inhibitions
- Below 1450 there will be no ‘INCREASE DESCEND x2’ RA.
- Below 1000 there will be no “DESCEND x2’ RA.
- Below 900 there will be no more RA: TA only.
- Below 400, TA aural alerts are inhibited.
Exactly as CaptainMongo stated.
When one of the Inhibitions is active, it is what it is. That means that below 900, the RA in progress is suppressed and converted into a TA.