Discontinued Items Check Box
In inventory have a two check boxes. One for items you as a business has decided to discontinue and one for items that have been discontinued by the manufacturer. If not 2, then at least one for discontinued. Then when running a movement report, for example, you could have an option to exclude all discontinued items. I know that you have a Alternate and Superseded boxes, but sometimes items are just discontinued. This would avoid the possibility of someone ordering an item you have decided to discontinue or an employee thinking an item is still available and telling a customer we can get it for them.