title: What is the correct behaviour when setting the cmi.exit variable
body: <p><strong>Scenario A:</strong> Suppose SCO A sets its <code>cmi.exit = suspend</code> and then triggers a Continue navigation request and SCO B is launched. SCO B triggers a Previous navigation request. In this case, should the Tracking Model (Objective Progress Info, Attempt Progress Info, and Activity Progress Info) of SCO A be set to default or not?</p>
  
  <p><strong>Scenario B:</strong> Suppose SCO A sets its <code>cmi.exit = normal</code> and then triggers a Continue navigation request and SCO B is launched. SCO B triggers a Previous navigation request. In this case, should the Tracking Model (Objective Progress Info, Attempt Progress Info, and Activity Progress Info) of SCO A be set to default or not?</p>