title: Feed for updating shipping price fails with No child element is expected at this point
body: <p>IM trying to update the shipping cost for my product. This is the feed that I submit: </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;AmazonEnvelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:noNamespaceSchemaLocation="amzn-envelope.xsd"&gt;
      &lt;Header&gt;
          &lt;DocumentVersion&gt;1.01&lt;/DocumentVersion&gt;
          &lt;MerchantIdentifier&gt;M_GAATUSALES_1356361&lt;/MerchantIdentifier&gt;
      &lt;/Header&gt;
      &lt;MessageType&gt;Override&lt;/MessageType&gt;
      &lt;Message&gt; 
          &lt;MessageID&gt;1&lt;/MessageID&gt; 
          &lt;OperationType&gt;Update&lt;/OperationType&gt; 
          &lt;Override&gt; 
              &lt;SKU&gt;112629&lt;/SKU&gt; 
              &lt;ShippingOverride&gt; 
                  &lt;ShipAmount currency="USD"&gt;120.00&lt;/ShipAmount&gt; 
                  &lt;IsShippingRestricted&gt;false&lt;/IsShippingRestricted&gt;
              &lt;/ShippingOverride&gt; 
          &lt;/Override&gt; 
      &lt;/Message&gt; 
  &lt;/AmazonEnvelope&gt;
  </code></pre>
  
  <p>This is the response that I receive from amazon. </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;AmazonEnvelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="amzn-envelope.xsd"&gt;
      &lt;Header&gt;
          &lt;DocumentVersion&gt;1.02&lt;/DocumentVersion&gt;
          &lt;MerchantIdentifier&gt;M_GAATUSALES_1356361&lt;/MerchantIdentifier&gt;
      &lt;/Header&gt;
      &lt;MessageType&gt;ProcessingReport&lt;/MessageType&gt;
      &lt;Message&gt;
          &lt;MessageID&gt;1&lt;/MessageID&gt;
          &lt;ProcessingReport&gt;
              &lt;DocumentTransactionID&gt;11074252872&lt;/DocumentTransactionID&gt;
              &lt;StatusCode&gt;Complete&lt;/StatusCode&gt;
              &lt;ProcessingSummary&gt;
                  &lt;MessagesProcessed&gt;0&lt;/MessagesProcessed&gt;
                  &lt;MessagesSuccessful&gt;0&lt;/MessagesSuccessful&gt;
                  &lt;MessagesWithError&gt;1&lt;/MessagesWithError&gt;
                  &lt;MessagesWithWarning&gt;0&lt;/MessagesWithWarning&gt;
              &lt;/ProcessingSummary&gt;
              &lt;Result&gt;
                  &lt;MessageID&gt;1&lt;/MessageID&gt;
                  &lt;ResultCode&gt;Error&lt;/ResultCode&gt;
                  &lt;ResultMessageCode&gt;5000&lt;/ResultMessageCode&gt;
                  &lt;ResultDescription&gt;XML Parsing Error at Line 16, Column 30: cvc-complex-type.2.4.d: Invalid content was found starting with element 'IsShippingRestricted'. No child element is expected at this point..&lt;/ResultDescription&gt;
              &lt;/Result&gt;
          &lt;/ProcessingReport&gt;
      &lt;/Message&gt;
  &lt;/AmazonEnvelope&gt;
  </code></pre>
  
  <p>Any ideas what I do wrong? I use Amazon Scratchbook for testing. </p>