title: use of unconstructed message 'msg_mymessage'
body: <p>I have a BizTalk orchestration with an expression.  The expression has the following:</p>
  
  <pre><code>construct msg_mymessage { msg_mymessage = msgInputXML; } 
  </code></pre>
  
  <p>msgInputXML and msg_mymessage use the same schema, same message type and both show up under the Messages in Orchestration view.</p>
  
  <p>After the expression I have a Construct Message and in the Construct message I have a Transform that uses msg_mymessage as a source and some other message as a destination.</p>
  
  <p>I'm getting the errors:
  use of unconstructed message 'msg_mymessage'
  'msg_mymessage':message has not been initialized in construct statement</p>
  
  <p>I'm not sure why I get this error.  What should I be looking for?</p>