Amazon MWS - Is it possible to reduce the order quantity using the OrderAdjustment feed

Question

When I send an Order Adjustment feed such as

<MessageType>OrderAdjustment</MessageType>
<Message>
  <MessageID>1</MessageID>
  <OrderAdjustment>
    <AmazonOrderID>104-3121897-1466636</AmazonOrderID>
    <AdjustedItem>
    <AmazonOrderItemCode>42555034632370</AmazonOrderItemCode>
    <MerchantAdjustmentItemID>6174012</MerchantAdjustmentItemID>
    <AdjustmentReason>NoInventory</AdjustmentReason>
    <ItemPriceAdjustments>
      <Component>
        <Type>Principal</Type>
        <Amount currency="USD">0.15</Amount>
      </Component>
      <Component>
        <Type>Shipping</Type>
        <Amount currency="USD">0.50</Amount>
      </Component>
      <Component>
        <Type>Tax</Type>
        <Amount currency="USD">0.00</Amount>
      </Component>
    </ItemPriceAdjustments>
    <QuantityCancelled>1</QuantityCancelled>
  </AdjustedItem>
</OrderAdjustment>
</Message>

it reduces the monetary amount of the order by the amounts in the feed, but does not change the order quantity, so the order still shows the original number of items as needing shipment.

According to the documentation, including the QuantityCancelled with an AdjustmentReason of NoInventory will create a partial cancel, but this does not seem to work.

Is there any way to reduce the quantity of items on an order?

Answer 1

I have been able to find out from Amazon that as of Sep. 2010, it is not possible to reduce the quantity and have that change show up in the Seller Central user interface. They acknowledged this as a bug that may be fixed at some point in the future.