How to Return a Fault in an Asynchronous Interaction
In an asynchronous interaction, the client does not wait for a reply. The reply activity is not used to return a fault. Instead, the BPEL process service component returns a fault using a callback operation on the same port type that normally receives the requested information, with an invoke activity.
For more information about asynchronous interactions, see Invoking an Asynchronous Web Service from a BPEL Process.