There's no straight forward method to achieve that at the moment, but we can come up with a solution. Off the top of my head, I'd simply close the issue (making it non-editable by default), and re-open it when the time comes. Only, I'd add a condition to the "re-open" step in the workflow, allowing only administrators to perform that.
Hope it helps.
Since launching the Jira Software 8.0 and Jira Service Desk 4.0 platform releases in February, many of you have been asking when the next Enterprise release will be so you can take advantage of the m...
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