This is the ValueSet that contains all the codes in Route of Administration ValueSet (https://www.ehealth.fgov.be/standards/fhir/terminology/ValueSet/BeRouteOfAdministrationVS) and Route of Administration ValueSet (https://www.ehealth.fgov.be/standards/fhir/terminology/ValueSet/BeRouteOfAdministrationVS). E.g. what you have to deal with if you get resources containing codes in either of them