Hi David,
The normal procedure is using Function Module RSDRI_INFOPROV_READ. However, according to the documentation it only works for DSOs, InfoCubes and MultiProviders.
Could you access as a work-around a MultiProvider? Or use any logic to first determine which PartProvider of the SPO-based DSO or InfoCube is required and then use the Function Module to read the data?
Best regards,
Sander