Thanks a lot fabian!
It was a wrong name problem as you told. Before it started working, I had to refresh the project, despite I tryed to restart eclipse IDE! But now I have my "Notification" new work item. But now I've lost "log" and "Email" Service Task (those I had before I added the new one). I think it depends by "drools.rulebase.conf" file that declares only MyWorkDefinition.conf....
Anyway, can someone tell me how to construct a web service connection work item (the remote WS wants a SOAP request through an https secure connection)?