title: The return types for the following stored procedures could not be detected
body: <p>While drag-drop a stored procedure in dbml file I get this error:</p>
  
  <blockquote>
    <p><strong>Unknown Return Type</strong><br>
    The return types for the following stored procedures could not be detected. Set the return type for each stored procedure in the Properties window.</p>
  </blockquote>
  
  <p>How can I resolve this error?</p>