Having issue when messages go through VS. The message CorrelationId becoming null and application can't subscribe the message.
CorrelationId may not be set properly in MQ VSM in Publis step could cause the issue.
In the MQ VSM-->Publish Step-->Message Properties show what is published to the queue. One of the message properties is CorrelationID and make sure this has the correct value or if you are capturing CorrelationID in a property use that.
In LISA 7.5.2 versions, "lisa.vse.correlation.id" gives the CorrelationId and the IBM WebSphere MQ message steps are deprecated in later versions of DevTest. If IBM WebSphere MQ deprecated steps are used in DevTest 10.1, then the CorrelationId is in "LIVE_RPLY.correlation.id" instead of "lisa.vse.correlation.id".