By default, the Terminology Manager is configured to allow duplicates.
The only exception to this involves terminology imports. Terms in import files typically have unique identifiers when they’re first exported from the Terminology Manager. The default Duplicate Detection Rule prevents you from importing the newer terms with duplicate UUIDs, but you can also change the import behavior to overwrite the older terms with the newer terms based on the matching UUIDs.
You may have instances where multiple terms with the same name and language aren’t permitted. You can adjust the duplicate detection rules to account for this.
To configure the duplicate detection rules, follow these steps
Go to Terminology > Customization > Duplicate Detection in the navigation menu.
In the Active column, select a duplicate detection rule to activate it.
Choose an action from the Behavior During Import dropdown to the right of the rule.
When users attempt to enter duplicate terms in the interface, the Terminology Manager always keeps the existing term and displays a list of conflicting terms according to the active rule.