Adjusting Shipment Quantities in Seller Central

Amazon allows you to edit the units of your shipment’s existing MSKUs up to a 5% threshold above and below the original amount (or up to 6 units). However, you will be unable to add additional MSKUs.

If you are needing to add more units than the above-mentioned allowance, you must duplicate the shipment or create a new shipment. Making quantity changes within this threshold will not impact your seller account or ability to send FBA shipments.

Here is a great Seller Central conversation thread about this:

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