title: Magento - UPS shipping returns error "Missing or invalid service code"
body: <p>I'm configuring UPS shipping in a Magento installation and when I'm processing an order for shipment (adding products to pack!age, etc.) - after hitting "OK" to generate a shipping label, the error "Missing or invalid service code" is returned. I've tried changing the package type, weight, delivery confirmation options - all give the same result. The gateway URL in the UPS shipping method configuration is set to <a href="http://www.ups.com/using/services/rave/qcostcgi.cgi" rel="nofollow">http://www.ups.com/using/services/rave/qcostcgi.cgi</a>. See attached image for error message. Thanks in advance for any insight that could be provided!</p>
  
  <p><a href="http://i.stack.imgur.com/IbocS.png" rel="nofollow">error message screenshot</a></p>