f:AuditEvent extension with URL = 'http://hl7.at/fhir/AISTPICA/R4/StructureDefinition/aist-pica-auditevent-ext-encounter': minimum cardinality of 'extension' is 1 extension with URL = 'http://hl7.at/fhir/AISTPICA/R4/StructureDefinition/aist-pica-auditevent-ext-encounter': maximum cardinality of 'extension' is 1 f:AuditEvent/f:entity what: minimum cardinality of 'what' is 1