Before you can use an airplane that is not already included in the GSX internal database ( and that one surely isn't, because I never heard of it before ), you must create a GSX configuration for it. This should fix the jetway issue.
The parking system ( assuming you mean one of the GSX VGDS ) issue, instead, seems to be caused by the airplane being named in an unusual way in its aircraft.cfg file. GSX tries to figure out the airplane kind by first checking the atc_model parameter and, if it cannot find it there, it tries to guess it from the airplane title. If both fails, meaning the airplane is named in a non-standard way so GSX cannot understand the type, it will be flagged as unknown in the VGDS.
