title: OpenERP Magento integration failed when try to import websites
body: <p>I've installed OpenERP 7 and Magento 1.7. One of my tasks is deploying a connector between them. I've installed the Openlabs OpenERP connector to Magento, and install magento-integration module to OpenERP from here (<a href="https://github.com/openlabs/magento-integration" rel="noreferrer">https://github.com/openlabs/magento-integration</a>).  </p>
  
  <p>The 'Test Connection' function works fine. After I click the <code>Import Websites</code>, the stack trace shown in the popup:</p>
  
  <pre><code>Client Traceback (most recent call last):
    File "/usr/lib/pymodules/python2.7/openerp/addons/web/http.py", line 204, in dispatch
  response["result"] = method(self, **self.params)
  ...
  File "/usr/lib/pymodules/python2.7/openerp/addons/base/ir/ir_model.py", line 861, in _get_id
  raise ValueError('No such external ID currently defined in the system: %s.%s' % (module, xml_id))
  ValueError: No such external ID currently defined in the system: magento_integration.instance_website_tree_view
  </code></pre>
  
  <p>I am not familiar with OpenERP (and python), so  my question is what is the <code>ValueError: No such external ID currently defined in the system: magento_integration.instance_website_tree_view</code>, and how to fix it?</p>
  
  <p>Thanks in advance. </p>