Is the FNSKU label for a product fixed when creating a shipping plan, or does it change for the same product?

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Thank you

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No, the FNSKU remains unique to you and your selling account.

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As @Kika says, the FNSKU for a product is fixed and does not change as long as the product remains listed under the same SKU in your Amazon account. It is unique to the combination of your product and your seller account, ensuring your inventory is identified and attributed to you. However, if you create a new SKU for the same product (e.g., for a different bundle, packaging, or variation), a new FNSKU will be generated.