title: How to set value in expression for scheme in BizTalk orchestration?
body: <p>When I want to compile, an error shown</p>
  
  <pre><code>use of unconstructed message
  </code></pre>
  
  <p>My code for expression is:</p>
  
  <pre><code>Message_2.Approved == false
  </code></pre>
  
  <p>XML code in scheme <strong>Article.xsd</strong>:</p>
  
  <pre><code>  &lt;xs:element name="Approved"&gt;
    &lt;xs:simpleType&gt;
    &lt;xs:restriction base="xs:boolean" /&gt; 
    &lt;/xs:simpleType&gt;
    &lt;/xs:element&gt;
  </code></pre>
  
  <p><strong>Message_2</strong> is assigned to assigned to a <strong>Send</strong> shape.</p>
  
  <p>And <strong>Message Type</strong> of <strong>Message_2</strong> is <strong>BizTalk_Server_Project7.Article</strong> .</p>