Hi. First @Andre: I think what Kevin meant is, that if you use the action mep="RequestResponse" in the service you call from the process the JbpmCallback is triggered outomatically, you don't have to code that yourself. But this is a different use case. There the Callback works as expected out-of-the-box without problems. Kevin wrote : | Okay, that explains things. It is the correlation between the internal EPR and external services that we are currently missing. | +1!!! This is what I raised already a couple of times: Removing the SignalCommand befor this problem is solved. I think there we should come up with some working solution shortly and document it properly. What do you think Kevin? And for integrating jbpm 4 we should find a really decent correlation mechanism :-) Cheers Bernd View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4238759#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...