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Once any envelope is in completed state, then there must be void option as well. if we want to cancel the agreement, we can do that from there itself and notification should trigger to all stakeholders.
Scenario - Recently we encountered this issue, Document has been signed from supplier and later all stake holder approved the case later realized that person who signed the document from supplier side was not authorized person to sing that document, in that case must have void option.
Once we have void option, on single click we can cancel it and get notified to all, it will save the time to reach out to everyone manually.