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The community moderator provided the following reason for archiving:
For all spreadsheet uploads, it is mandatory that a unique key be included as a product identifier. You will need to choose from one (or more) of the following: UPC, GTIN, EAN, ISBN, and Vendor Partner Number. If a particular identifier is chosen, it will have to be included for all item management. The unique keys must be formatted correctly and must meet the corresponding character limits as highlighted in the Universal Catalog Attributes Guide. If an item is uploaded with an incorrect unique key, the incorrect unique key will need to deleted and re-added, which can be conducted with the same spreadsheet upload.