JIRA doesn't allow you to lock fields. The work around is to put the field on a transition screen for a transition with a condition of a particular project role. Then put the field ONLY on the view screen. Put the transition anywhere you want to be able to change the field.
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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