This simple use case ensures, that all sub-tasks of the current issue are resolved.
You can either hide the transition using the Condition on sub-tasks or block the transition using the Validation of sub-tasks.
Add the condition or the validator to the desired transition or create a new transition.
Choose sub-task
Choose the desired sub-task status you want to evaluate, e.g., "Done".
Choose the desired resolution(s), e.g. "Done"
There are unresolved sub-tasks, please resolve all sub-tasks before proceeding with this issue.
Condition on sub-tasks
Validation of sub-tasks
Ensure that that all sub-tasks of the current issue are resolved.