Wait step triggered by event raised within current workflow instance

[Peter Abram]

A parallel (fork) branch of the workflow contains a wait step listening for
event BUS2012 SIGNIFICANTLYCHANGED - with the intention of terminating the
current instance if significant changes are made to the purchase order
outside of the current workflow instance.
 
The event BUS2012 SIGNIFICANTLYCHANGED event can be raised within the
current workflow instance because there is a step referencing transaction
ME22N.
 
How do I prevent the branch containing the wait step from reacting to the
execution of the ME22N work item within the current workflow instance
(assuming the agent does make a significant change)?
 
 
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