title: Magento - addAttributeToSelect for multiple fields not working
body: <p>I am trying to get the user orders history, used the following query and its working fine. But its returning all the order related fields from table</p>
  
  <pre><code>    $collection     = Mage::getModel("sales/order")-&gt;getCollection()
                                 -&gt;addAttributeToSelect('*')
                                 -&gt;addFieldToFilter('customer_id', 400)
                                 -&gt;setOrder('created_at', 'desc');
  </code></pre>
  
  <p>I want to fetch only particular fields, so in case of <strong>->addAttributeToSelect('*')</strong></p>
  
  <pre><code>     used the following code 
  
   -&gt;addAttributeToSelect(array('created_at','customer_id','increment_id','updated_at','status','entity_id','state'))
  </code></pre>
  
  <p>But getting error as <strong>"Cannot determine the field name."</strong></p>