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.
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.
To configure the Transition Subtasks Workflow Post-Function, follow these steps :
<post-function > <function type="class"> <arg name="class.name">com.minyaa.workflow.function.TransitionSubtasksFunction</arg> </function> </post-function>