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Features used to implement the example

Example: Prevent transitioning when there is a blocking issue

I’m sure that what I want to do is really simple, but can’t work out the syntax to do it. I’ve got 4 sub-tasks, call them Sub-Task 1, Sub-Task 2, Sub-Task 3, Sub-Task 4. Links have been set up so that Sub-Task 1 blocks the other 3.

I want to modify the workflow so that Sub-Tasks 2, 3 and 4 cannot be transitioned (on a Scrum board) from "In Progress" to "Completed" until Sub-Task 1 has been Completed (Status = Resolved) or Accepted (Status = Closed) but can’t work out what check boxes to set. I’ve tried a few combinations but nothing I’ve tried has restricted the transition.
I show you how to do it using Validation on linked issues in screenshots:

Once configured, the transition looks like this:

Alternative implementation

Another way to do it by forbidding statuses:

Once configured the transition looks like this:

Related Usage Examples