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