My reference comes from our company manuals. I don't have access to the Airbus Master copy but with us it is pretty much all from airbus.
Part B 2.3.18.1.2
Non Precision Approaches
For Non Precision Approach, the final approach shall be flown as a Constant Descent Final Approach (CDFA) to the appropriate minima.
Lateral managed guidance (NAV) can be used for overlay non-precision approaches provided the following conditions are met:
The Navigation Database must be current.
The approach is stored in the navigation database.
GPS PRIMARY must be available.
Conventional aids must be displayed.