AT:

• attach multiple escalation boundary events to an activity / subprocess
• the boundary events should have a diffent escalation event definition / escalationCode
• an escalation boundary event without escalationCode (or empty escalationCode, or no ecalationRef) catch all escalation events
• an escalation boundary event with escalationCode have precedence over an escalation boundary event without escalationCode
• similar behavior to error propagation
• use the same behavior for escalation event subprocess