TODS-E314

Supplement row references a GTFS entity that does not exist

ERROR

Needs a companion GTFS feed.

A supplement row names a route, service, trip, or stop that is not in the supplemented GTFS feed (for example, a trip added by trips_supplement.txt with a route_id that exists nowhere). The merged feed would not form valid GTFS.

Spec reference: https://tods-transit.org/spec/#supplement-files