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