Purging Invalid Combos "Use Active Data Only

In our primary account group there are many rows with combinations that are actually invalid as they reference long-since inactive departments or accounts.

We wouldn’t normally notice this unless we tried to edit a transaction that was very old and referenced these combinations – we’d get an error probably on the page because the drop down value for the account or department was invalid. 

Build Combination Data seems to have an setting (Use Active Data Only) that would let us remove them. It indicates that we might not want to do it if we edit old values – but I can’t see how that would happen anyway for the aforementioned reason. If you somehow tried to edit an old Invoice that referenced an invalid department, you’d get an error on the department field – it would never even make it to the drop down edit.