If you put the route in using the waypoints and zoom right in you can see that it's going via
TBD NDB instead of the VOR (there is some distance between them) and the NDB is not part of the airway. You can get around it by putting the next waypoint in and then the airway, AD
TBD HINDY Y12 ARBEY ML, but it should have the ability to select from the VOR or NDB for any navaid like that. Another route that doesn't work is ML DOSEL Y59 SY. It won't accept DOSEL as the start of Y59. That must be a database issue though as DOSEL is not ambiguous. They've got a way to go with it. Being able to save routes seems like a no-brainer.