When an user is assigned to a ticket which is still in open status, then the other users/project admins shouldn't be able to assign that user to another tickets. Is it possible to achieve this using any technique/method?
No, there's no way to do that.
You could do it if you were using DC though, but you'd need to rewrite and recompile bits of Jira to do it.
Thanks Nic
There is definitely a workaround which you can use to achieve this. It might not be straight forward but it gets the job done.
The approach I would take is basically creating an automation, listening to the assigned trigger, checking if the assignee already has open ticket(s), then add a comment saying that the user has other commitments (optional), and finally unassign the issue.
This is basically your own custom validator like automation.
Here is a screenshot which you can use as a draft:
Hope it helps!
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