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Features used to implement the example

Example: Block creation of issue type X if it has not been linked with link type Y to issue type Z on the "Create Issue" screen

I have an issue hierachy that at the moment is not mandatory (that means that you can create an issue without being linked to anyone). I would like to enforce this hierarchy.

You have to use validator Validation on linked issues. I will show the configuration to use for an example to enforce to set at least one "has Epic" issue link with an "gh.issue.epic" issue type. In this example, the linked issue can be at any status and with any resolution.

Once configured, transition will look like this:

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