Pretty old question
Not supported out of box - https://jira.atlassian.com/browse/JRASERVER-7990
Using script runner plugin you can put an condition in the "validation" phase of the create transition
Using script runner plugin, the script will be part of "validate" phase of the "create" transition thus, validation will execute after pressing the "create" button.
If you want a client side solution (though JS solutions arent always the cleanest) you can look into "behaviour module" of the scriptrunner plugin
Please accept/upvote answer if it works for you. Thanks.
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