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Execution creation - why there is new execution created

Question asked by tomekzaremba on Dec 9, 2015
Latest reply on Dec 10, 2015 by jbarrez

we are evaluating Activiti as engine for next project developed in our company. I'm new, so my question may be a little bit silly. I don't understand what are the rules of execution creation?

On attached image I show part of my BPMN process. Execution ids are given for each serviceTask. First question: why modifyParty block is executed in separate execution? For me it causes variables scopes problem - result of this serviceTask must be saved in execution local scope. Because new execution is created - result is lost.

Secondly: after modifyParty block I start subProcess for processing each item in contracts collection (in multi instance way). Same question as earlier - why transferService block is executed in new execution instance and not within same as "Set contract to PROCESSING" and "Set contract to WAITING". Following message-catch event also created new execution.

Here's the image: