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What product/version are you running when encountering this issue ?
As you can see from the error message you "correlation set" is empty. Normally BPEL should be able to handle correlation by itself but when this goes wrong you can force it by setting up custom correlations.
You can find more info on Antony's blog https://blogs.oracle.com/reynolds/entry/bpel_correlation
I've encountered this problem many times before on 10g. Just forcing correlation solved this.
Essentially the issue is that you are invoking 2 asynchronous services and your service does not know which request the response is for. The easiest way is to set a conversation id, please refer to section 8.2.5 of the developers guide for your answer(http://docs.oracle.com/cd/E29505_01/dev.1111/e10224/bp_async.htm#CHDCFGEJ).