how does mediator handle multiple responses

    I have a mediator that routes the same message to two BPEL processes. When the two processes return, they send back different responses. Which response will the mediator route back to the original caller?

    I can't see how one can combine them, because they may return at different times, and they may be different. If someone knows how to combine them, that would be great.

    If it can't be combined, is it time based, the first BPEL response is used or the last response is used?