This brief asks how often a workpaper relies on an earlier file after the source owner has issued a documented replacement. The outcome depends on a visible event rule, not on a reviewer's impression after seeing the records.
The public sources below support traceable records, controlled access, documentation, and reviewable evidence. Applying those principles to source-file version drift is OffshoreBookkeepers.com analysis. The cited organizations do not report or endorse the proposed measure.