If the UPS instance was updated but with modifications made by the Origin-Server, the response message shall include the following HTTP/1.1 header:
Warning: 299 {+SERVICE}: The UPS was created with modifications.
If optional attributes were rejected, the response message shall include the following HTTP/1.1 Warning header field:
Warning: 299 {+SERVICE}: Requested optional Attributes are not supported.
If the request was rejected with an HTTP/1.1 409 status code, the response message shall include one of following messages encoded in an HTTP/1.1 Warning header field describing the nature of the conflict:
Warning: 299 {+SERVICE}:The Transaction UID is missing.
Warning: 299 {+SERVICE}:The Transaction UID is incorrect.
Warning: 299 {+SERVICE}:The submitted request is inconsistent with the current state of the UPS Instance.