The approval section raises a useful failure case for the test pack: the human approves an accurate preview, then the underlying record changes before the tool executes. The review can be completely genuine while the eventual write still has a different consequence.

I would bind the approval to the exact proposed field changes and the record version, then reject execution if either has changed. One test can deliberately edit the supplier record between approval and execution and check that a fresh review is required. That extends reporting accuracy across the approval boundary itself.