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