Editing old revisions

We have a requirement for multiple active revisions being in use. I've worked out accessing the old revisions, but ARAS does not allow me to edit a revision once it has been superseded. For example, we have a model that is released and we want to rev it, eventually obsoleting it, but while that new revision is being developed, the current revision is still active and may need to have changes made to the description or documents added to the item. Where is the access to the lock/unlock functions managed?
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