The Parent issue in status condition allows you to hide a workflow transition if the parent issue is not in the correct status.
Set the Parent issue types field to decide if any or only selected link types will be taken into account. If Selected was set, choose the issue type in the Issue types field
Set the statuses that the condition will check in the are in status field
Activate the JQL condition option and define the JQL query that has to be met by the issue in order for the condition to work (e.g. “type = Bug and Priority = Blocker”)
Activate the Executor condition option if you want the condition to work only if the user is or isn’t in a certain Jira user group or project role
Select if The executor has to be or can’t be a member of a certain Jira user group or project role
Select a Jira user group in the Group field if Group was set in the member of a field
Select a project role in the Project role field if Project role was set in the member of a field