How to make a whole document obsolete?

Hi everyone,

To make a document obsolete, we need to add a date into the Date Obsolete field within Director for the document. However if the document has multiple revisions, and I add this to the current/latest revision, then it won't add it to the historic revisions. Is there a way to make the whole document obsolete or is the method to do this by adding a Date Obsolete date to each revision?

Many thanks,