This is the ValueSet that contains all the codes in MedicationAdministration Performer Function Codes (http://hl7.org/fhir/ValueSet/med-admin-perform-function) and MedicationAdministration Performer Function Codes (http://hl7.org/fhir/ValueSet/med-admin-perform-function). E.g. what you have to deal with if you get resources containing codes in either of them