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How to move Amazon items from FBM to FBA without unwanted orders

Zero merchant-fulfilled Amazon stock in Acenda before you switch a SKU to FBA, so Amazon doesn't keep taking orders you can't ship.

To move Amazon items from merchant-fulfilled (FBM) to Fulfilled by Amazon (FBA) without leftover orders, zero the SKU's merchant-fulfilled stock from Acenda before you switch it in Seller Central. Acenda's Amazon connection updates merchant-fulfilled stock only. Once a SKU is FBA, Amazon owns that stock, and Acenda stops sending inventory updates for it.

Why the order of steps matters

Leftover merchant-fulfilled stock on Amazon does not get cleared after the switch, because Acenda has already stopped updating that SKU. Amazon may then keep taking merchant-fulfilled orders that you can't ship, and canceling those orders can hurt your account health. Zeroing the FBM stock first prevents this.

Important: Zero the merchant-fulfilled quantity in Acenda before you switch the SKU to FBA in Seller Central. If leftover FBM stock stays on Amazon, Amazon may keep taking merchant-fulfilled orders you can't ship.

Note: Selling the same item through both FBA and FBM? Set up a separate SKU for each. Use one SKU for FBA and a different SKU for FBM that Acenda keeps managing with its normal Listing Action. The steps below are for moving a SKU fully to FBA.

Switch items from FBM to FBA

The switch starts in Acenda. Confirm that Amazon shows 0, then change the SKU to FBA in Seller Central.

Zero the SKU on Amazon from Acenda

Set the Amazon Listing Action to ZERO before you change fulfillment in Seller Central.

  1. Open CATALOG > Items in the sidebar. Search for and select the product.

  2. Open the Channel Status tab. On some accounts this still shows as three separate tabs — Channel Mapping, Channel Status and Suggested Fixes — instead of one combined view. If you see three tabs, use the Channel Mapping tab for this step.

  3. Click the tab for your Amazon channel.

  4. Click Edit (or Add Mapping if the product is not yet mapped to that channel) and set Listing Action to ZERO. Save your changes. Acenda sends 0 to Amazon for that SKU only, and your other channels are not affected.

Note: Don't set the product's inventory to 0 to do this. That would zero the item on every channel. Use the Amazon Listing Action only.

Tip: Moving many SKUs? Use a Channel Item Mapping import to set Listing Action to ZERO in bulk — see How to map products to channels and set listing actions — or contact Acenda Support for a template.

Confirm Amazon shows 0

Amazon needs to show a merchant-fulfilled quantity of 0 before you switch the SKU to FBA.

  1. Allow up to an hour for the update to reach Amazon. Acenda sends Amazon stock updates about every 30 minutes. For the Amazon inventory schedule, see What is inventory sync to your marketplaces?.

  2. In Seller Central, open Manage Inventory and check that the merchant-fulfilled quantity for each SKU shows 0.

  3. Ship or cancel any open merchant-fulfilled orders on these SKUs in Seller Central.

Switch to FBA in Seller Central

Seller Central is where you change the fulfillment method and create the inbound shipment.

  1. Convert the SKUs to Fulfilled by Amazon in Seller Central and create your shipment to Amazon as usual.

Check after the switch

Confirm the merchant-fulfilled offer is gone, and keep the Acenda Listing Action at ZERO.

  1. Check that each SKU shows only as Fulfilled by Amazon, with no merchant-fulfilled offer or quantity left.

  2. Leave the Acenda Listing Action at ZERO.

Switch back from FBA to FBM later

A SKU can be switched back to merchant-fulfilled later. Use this order so Acenda starts sending your real stock levels again.

  1. In Seller Central, change the SKU back to Fulfilled by Merchant.

  2. In Acenda, set the Amazon Listing Action back to FULL.

  3. Within about 4 hours, Acenda picks the SKU up again and starts sending your real stock levels.

Troubleshooting & FAQ

  • Can't Acenda zero the stock after I switch? No. Once a SKU is FBA, Acenda's merchant-fulfilled connection leaves it alone, so the zero has to happen before the switch.

  • Will this affect my other marketplaces? No, as long as you use the Amazon Listing Action rather than changing the product's inventory.

  • Can I sell the same item as both FBA and FBM? Yes. Set up distinct SKUs, one for FBA and one for FBM.

  • What if Amazon still sends merchant-fulfilled orders for an FBA SKU? Set the quantity to 0 directly in Seller Central and open a Seller Support case. That's an Amazon-side issue that Acenda can't correct, because the SKU is no longer merchant-fulfilled.

  • How do I switch many SKUs at once? Use a Channel Item Mapping import to set Listing Action to ZERO in bulk. See How to map products to channels and set listing actions. You can also contact Acenda Support for a template.

Still have questions? Contact Acenda Support.

Information sourced Nov 10, 2026. We do our best to keep this accurate, but this article may contain mistakes. Amazon's Seller Central guidance always takes precedence for steps you complete on Amazon's side.

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