Record numbers cannot be reverted back to names once updated. If you check Update, a number is assigned to each existing record of that type, and the name is stored in a separate field.
You can return to this tab at any time to turn on or off numbering for new records; however, once numbered, records will be listed by number instead of by name. It typically takes just a few minutes for 5000 records. While it is running, this tab will not be available.
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