If it helps in terms of what:
1. Your
SOAP Message sent from the client to the Web Service Provider: Message Level Security + UNT.
A SOAP message with a timestamp that does not expire is vulnerable to replay attacks.
2. See Setting the SOAP Message Expiration
http://docs.oracle.com/cd/E13222_01/wls/docs92/webserv/security.html
WS-Policy: See <MessageAge> Element
3. For more detail, GOOGLE for terms like SOAP Message Expiration, replay attacks