This is the ValueSet that contains all the codes in BeVSAnnex81ReasonCode (https://www.ehealth.fgov.be/standards/fhir/drp/ValueSet/be-vs-annex-81-reason-code) and BeVSAnnex81ReasonCode (https://www.ehealth.fgov.be/standards/fhir/drp/ValueSet/be-vs-annex-81-reason-code). E.g. what you have to deal with if you get resources containing codes in either of them