Support for such asynchronous exchanges of messages (aka multi-step conversations), between a BPEL process and a Web service peer (aka partner), requires the use of message correlation. Correlation can be either implicit - by using WS-Addressing header information (i.e. reply-to address and correlation ID) in the SOAP message, or explicit - by using a set of pre-defined correlator fields in the request as well as response messages.
For more information, refer to this article.
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