In this example, the transition will only be executed (or displayed in case of a condition), if the current user is the reporter of the issue.
Add the condition or validator to the desired transition or create a new transition.
Select field Reporter
Choose =
Select field Current user
The current user must not be the reporter!
Compare two values condition
Compare two values validator
Current user must be reporter.
This use case is valid for both conditions and validators. The only difference is that you can specify an additional error message when using a validator.