The problem you need to solve: Be able to perform transition for Sub-Tasks.
How Minyaa solves this problem: A Workflow Post-Function able to try the transition of Issue's Sub-Tasks.
How it works
The Post-Function requests to the Auto-Transition Manager to try to perform, for each sub-Tasks, a transition identified by the Action Id and flagged using the Flag Condtion.
Configuring the Feature
To configure the Transition Subtasks Workflow Post-Function, follow these steps :
Add the Transition Subtasks Post-function to any wanted transition, that will be Initiator of the Transition on the Subtasks.