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Sorting the classification items, if rearrange happens, will not affect the data.
Deactivating a one-selection classification makes the selected item disappear from module, but it is not wiped out. When doing a search, it shows the deprecated selection still. The previous selection will be replaced if new selection saved.
Deactivating a multiple-selection classification, does show the inactive selection (marked as inactive) and allows you to choose other selections. New selections will not wipe out the deprecated chosen items.
Deactivated items are not visible to choose from.