Workflow - Avoiding that a task can be closed when still open subtasks.

Hello everybody.
I have to create a workflow with the following rule :
Issues of the type "epic" cannot be closed as long as there are subtasks (i.e issues with the type "task") that are not closed yet.

Is there anyone who can help this newbie ?
Thank you very much !
1 comment
Please see similar examples: JT-17131 and JT-17670.

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