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Features used to implement the example

Example: Prevent addition of new sub-tasks if the parent issue is in "Resolved" or "Closed" status

Let's see how to prevent addition of new sub-tasks if parent issue is in status "Resolved" or "Closed".

You only have to add validator Validation based on regular expression to transition "Create Issue" with the following configuration:

Once configured "Create Issue" transition looks like this:

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