This is the CodeSystem that contains all the codes in EPA Operation Outcome Details CodeSystem (https://gematik.de/fhir/epa/CodeSystem/epa-operation-outcome-details-codes) and EPA Operation Outcome Details CodeSystem (https://gematik.de/fhir/epa/CodeSystem/epa-operation-outcome-details-codes). E.g. what you have to deal with if you get resources containing codes in either of them