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Duplicate Value Found - Data Loader

Knowledge Article Number 000211732
Description When running an update via Data Loader, you may encounter the error "duplicate value found".
Resolution This is due to a duplicate within a "Unique ID" field.  The "Unique ID" pertains to custom fields where you have checked the box for "Unique ID".  These fields are automatically checked for duplicates in the background by native Salesforce functionality.  If you are receiving the error "duplicate values found", you must either remove the duplicates or in the case of an update, do not map the field that houses the unique ID.

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