If your company utilizes packages which includes wiring, if a change order is made, the wire will be deleted unless you only modify certain items within your package. This presents new issues, such as having to modify the entire package to represent the new items, which then is no longer linked to a package in your Library. PLEASE allow either locking of items in Visio, replacing items with new ones, or a dynamic programming which understands when wires/items are replaced with the same item and wont be deleted.