I'm trying to publish a feature service on ArcGIS Server from ArcMap. The layer within the map is sourced from a feature class in a File Geodatabase that is part of a relationship class with another f-class in the same GDB. I keep getting an error code 00134 saying "Layer's data source is not supported". From what I've read regarding this code it sounds like only relationship classes within an enterprise database can be published to a feature service. Is this correct? If so, why?
ArcGIS Desktop and Server v10.8.1