Mark,
If the conv ID is same for the next set of document coming into TN, then modeler wouldn’t initiate the start of a new instance of a Business Process but would use the process which was initiated by the document arrived prior to the current document.in other words, it would join the running process.
It is not mandatory to use the TN conv ID as the process ID, but you can use a custom ID also.
just my 2 cents.
ramesh.
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