First of all thanks for your always updated navdata!
I just come back from a diversion flight to KTUS. The vatsim controller assigned me an approach to RNAV 21. In navigraph I have the charts for this approach, but it did not show up in the FMS as an available option. All other approaches were available though. Could you check if it’s really missing in the database? Otherwise it might be an issue with the FMS (using the WT CJ4 mod).
thanks for your help!