PENKO,
I'm not going to mention the maker's name (litigation and all that), but there is one currently used FMS for wwhich there is a CURRENT warning that the FMS MAY make the incorrect entry.
If you want to PM me, we can discuss it, but your use of the term FMS (as opposed to FMC) got my interest, the 'rogue' system is an FMS.
Regards,
Old Smokey