Hi,
Could you please give us some more details about what are you trying to do? (just a short presentation of the scenario)
This way the community members will have a better understanding of the problem you want to solve and may come with more targeted advices.
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Considering the order of the tasks is a logical order (which could change according to some conditions, events, errors, etc…) i think you could make use of the associated BPMNModel in order to have a flow diagram of the process.