IC Internal Usage - Reverse?

Had a user today accidentally write off a huge QTY of an item today due to using wrong UOM.  Just wondering what other users would do to reverse this?  Obviously I can just adjust the items back in but our reports would still see that usage number and it will show it as a spike usage for years to come.  I'd like to find a way to back out that usage.

I wish there was a way to un-use an item.  Slight smile

Just looking for some input in case anyone has encountered before.  Normally I just adjust it, but in this case, it's a large QTY.