Restrictions on nested use of #lockThreadIn:
          Reason for change
          The restriction is that you can't make another SCI call within the exception handler of the SstTimeout (or any other exception handler invoked while a lockThreadIn: is in process).
          This is because, in 8.6.3 thread, management SCI code that was in the essci40.dll was moved into the image.
          Action required
          No  workaround is available. 
         
        
          Last modified date: 07/25/2019