A310 fms fpln page unable to enter ndb

When i made a flightplan for procedure training in the fpln page of the fms i can enter everything like the SID, STAR or direct to a VOR, waypoints, all works. But i can’t enter a NDB locator. My location is EBOS. I can enter COA vor, DENUT waypoint, all works but entering ONO ndb and nothing happens. It don’t appears in the flightplan. Did i miss something?
A NDB further away like MAK is recognized and can be entered. The ONO is located on the ILS. I use Navigraph for up to date data. No problem with the PMDG 737. Any help appreciated.

Gino

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