We have an issue which I'm sure many also have where end users choose CS for case instead of CA. Many of our EDI vendors accept CS for case but send CA on the advanced ship notice and invoice line which causes errors in processing. It's very rare that we would use CS for cassette and in reality EA can be used. I'd like to inactivate CS but that's not an option in IC00, I can only delete to remove it as a choice for the end user. My question is - how might deleting a UOM that has been used previously on reqs and POs (I would make sure all lines with CS are closed or change the uom to CA on any open lines) affect old data? Could we see data corruption if the UOM doesn't exist in IC00?