This is the ValueSet that contains all the codes in ActRelationshipRe-challenge (http://terminology.hl7.org/ValueSet/v3-ActRelationshipRe-challenge) and ActRelationshipRe-challenge (http://terminology.hl7.org/ValueSet/v3-ActRelationshipRe-challenge). E.g. what you have to deal with if you get resources containing codes in either of them