A SKU here is a merchant-managed code distinguishing a product or stock record, commonly at variant level. The company controls its own codes.[1] It is neither a globally standardised GTIN nor a physical quantity: many units can share one SKU.
Use a stable structure and avoid reassigning a code to a different item. Store external identifiers separately so warehouse, webshop and supplier records can be mapped correctly. One code covering all sizes can conceal shortages if those sizes are ordered and delivered individually.
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Compiled with AI assistance using public sources. General explanation, not individual legal or tax advice. Describing a concept does not mean Zoloo offers it as a feature.