Updating custom fields on superseded Items

Hello,

We have a program which we run to update Export control codes on our parts, this is to obviously restrict access to comply with Export control regulations and as such is very important.

The issue we are having is that we can update the active revision of the part but we need this to cover all revisions as we would not want someone to access these if they are controlled items.

how can we update these custom fields on older revisions and superseded items?