A collection of error, warning or information messages that result from a system action.
HL7 FHIR STU3 Resource:
Spine Operation Outcome
The OperationOutcome resource provides information back in response to an API call for any error, warning and information messages which may need to be returned - usually in place of whatever output the client may have expected.
The most common use-case for this is to provide error messages back when an operation has failed for some reason. See the error handling page for details of specific error and warning responses that may be returned.