Can I restrict adding ad-hoc tasks to a case and subtasks to a task?
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You cannot prevent adding sub-tasks to a task, but you may suppress the option to add an ad-hoc tasks to a process. To archive this, you need to restrict access rights to the corresponding process, e.g.:
More information on this topic you can find here: https://documentation.signavio.com/suite/en-us/Content/workflow-accelerator/userguide/access-control.htm#Restrictaccesstoprocesses
KBA , BPI-SIG-PG-EDT , Process Governance Editor , How To