fsAerodata database has some limitations when dealing with other add-ons since the database cannot modify any data included on an add-on airport and FSX/Prepar3D does not have mechanisms to properly update the navigation data.
On Prepar3D v4.5 Hotfix2 or higher, the FSAD entries must have lower priority than 3rd party airports and global scenery packs.
The guidelines outlined below are not valid for this Prepar3D version.
On FSX, Prepar3D v4.5 Hotfix1 or lower, as long as FSAD entries have higher priority than 3rd party addons, FSAD approaches, comms and ILS data take preference. If FSAD has a lower priority, then native or payware addon approaches /comms/ILS take preference.
Nevertheless, there are some elements that can be updated by FSAD; below is a summary of the steps to follow to give priority to FSAD data over other add-ons /example below is with Orbx regions):
Notes:
Several new Prepar3D add-ons are installed using the add-ons method, and as result, their entries are displayed as greyed out in the scenery list. In this case, the fsAerodata entries cannot be moved to a higher priority using the standard procedure. To overcome this limitation, there are freeware tools like Lorby Prepar3D Addon Organizer that can be of help unlocking those entries and reassigning the priority list.
More info here: http://www.lorby-si.com/downloads.html
Any help or clarifications pleases let me know,