Okay, I managed to find what I think is the original thread. For 7.5.2 the answer is in there, but here is the gist:
In your VSI, make sure each of your responses has the correct queue in the meta-data property 'dest.destination'.
If your request contains a replyTo queue, then edit/add another meta-data to each request: 'disregardReplyTo' = 'true'.