Boundary escalation event

Boundary escalation event activity directs process to another flow by throwing and escalation and can be only attached to an embedded sub-process or a call activity, since an escalation can only be thrown by an escalation intermediate throw event or an escalation end event. When boundary escalation event acitivity is triggered by an escalation event from a call activity, then the defined output variables of the call activity are passed to the scope of the boundary event.