The fact that that field is locked means that you can't change its configuration. This is because that is meant to be managed by JIRA Agile.
So, your problem is most likely rooted somewhere else, not in that field being locked. That always is.
We've noticed this issue with other customers and are tracking this as a Bug on: https://jira.atlassian.com/browse/GHS-12191.
Please add yourself as a watcher to receive updates as they become available and include any feedback you may have.
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