Troubleshoot Fulfillment Issues

Steps to try if you receive an error when attempting to send fulfillment requests to FBA or Shipwire through ShipStation.

Fulfillments are orders that are sent to a fulfillment partner, such as Fulfillment by Amazon or Shipwire and are marked as shipped in ShipStation.

Possible errors:

  • The request must contain the parameter Item.SellerSKU

  • Value XYZ for parameter Items.SellerSKU is invalid. Reason: InvalidValue

When this error occurs:

The most common fulfillment issue occurs when the product SKU in ShipStation does not match the product SKU on record at your fulfillment center.


Update the product details in ShipStation with the correct fulfillment SKU for your product.

Update the Product Fulfillment SKU

  1. Click the item name on the Order Details page to open the Product Details window.

    An order item is displayed with the item name highlighted.
  2. Select the Shipping tab.

  3. Enter the Fulfillment SKU that matches the SKU on file with your fulfillment center. Then, click the Save button.

    The shipping tab of the product details screen is shown with the fulfillment sky field highlighted.

Things to Know

  • Check the box to Apply changes to open orders if you have orders that have already imported into ShipStation that need to be sent to a fulfillment center.

  • For FBA, be sure to use the MSKU value for the product as listed in your Amazon account.

  • The Fulfillment SKU field can only contain a single SKU. If you're using both FBA and Shipwire, you'll need to make sure the product uses the same Fulfillment SKU for both fulfillment services.

  • To update the fulfillment SKU for multiple products at once:

    Use the product CSV import to import all of your products and update them together. Enter the Fulfillment SKU into the FillSku field to be sure all of your products have valid SKUs for your fulfillment provider.