how I can build the bpmn process from execution log?
I can see from your other question (https://community.bonitasoft.com/questions-and-answers/how-i-can-analyse...) that you are interested in Process discovery and analytics.
There are many open-source projects working on those topics and I would sugget you have a look at this experimental project which might help you build something: https://github.com/process-analytics/bpmn-layout-generators
Thanks Delphine for this link
Please about message_instance table I can't find any thing? HowEver in my process there are many messages exchanged!