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The Unique property prevents the duplication of current content across entries in a content type.
Note: The Unique property works only for content types with “Multiple” entries.
When you add a field to a content type and set it as Unique, that field will only accept non-duplicate values. If a user enters an existing value, they will get a prompt to change the duplicate value.
Note: If any fields are marked as Multiple then the Unique property will not work.
