Hi sbremal!
You can create a sub process to handle your web service calls. See the following process:
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-777343-19905/450-128/Subprocess.png
I created a workitem handler for web service calling. The result of the web service call will set in a process variable. If the call fails, the process starts a user task and choose: retry, skip or abort. The user choise will set in an other process variable and evaluate in a gateway.
