How to prevent Parent ticket from transitioning when Sub-Task ticket is not closed

[TD]

I am using Jira Service Management Data Center and I would like to know how to prevent a parent ticket from transitioning until all sub-tasks are completed.

I tried going to the workflow and editing the Conditions value to, "All sub-tasks must have one of the following statuses to allow parent issue transitions: CLOSED, DELINED, CANCELED or DONE" but the parent ticket still transitions. 

Process:

1. Open ticket

2. Create sub-task from the Edit menu within parent ticket

3. Attempt to transition Parent ticket <- this parent still transitions even though the  sub-task ticket is set to "Open"

[TD · Accepted solution]

Nevermind, I figured it out. I had to set the condition for EVERY possible transition I have in my workflow.