There is none for that rule specifically - I have put in a support
ticket for this as it does not feel like intentional behavior. Workfront
has "All Predecessor Task Completion to Task Dependents" which will send
a notification, but only if the predecessor is on the task the user is
assigned to. This does not work for sub tasks with a predecessor on the
parent task. I tested with a report, sub tasks with predecessor parents
switch the field canStart from false to true, but this does not trigger
...