If the User-Agent specifies a Procedure Step State (0074,1000) attribute with a value of "CANCELED" and the UPS Instance is already in that state, the response message shall include the following HTTP/1.1 Warning header field:
Warning: 299 {+SERVICE}: The UPS is already in the requested state of CANCELED.
If the User-Agent specifies a Procedure Step State (0074,1000) attribute with a value of "COMPLETED" and the UPS Instance is already in that state, the response message shall include the following HTTP/1.1 Warning header field:
Warning: 299 {+SERVICE}: The UPS is already in the requested state of COMPLETED.
If the request was rejected with an HTTP/1.1 409 status code, the response message shall include one of following messages in the 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.