You need to execute a business logic before calling the event to complete task. As mentioned at KBA 1922738 BPM allows to open several windows of one task for same user. If the business logic executes twice then system could face data inconsistency issues. You need a way to ensure that a business logic is not executed twice in different windows.
UWL task open in 2 windows, BPM UWL task opened in 2 windows, BPM Public API, business logic, web dynpro, UWL , KBA , BC-BMT-BPM-DSK , Process Desk , BC-WD-JAV , Java , How To
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