Parent Status Validator
When you add this validator to a transition with required options and trigger the transition, the add-on checks the status of the issue's parent. If the parent issue is not in one of the selected statuses then an error message is displayed.
The list of statuses that is displayed under the Status of parent issue
has all the statuses across different workflows. This is because the workflow of a parent and child can be different.
Validator Scope
To execute this validator based on the result of a groovy expression see Conditional execution using Groovy expression