B2B Toolkit AS2 Adapter Sender channel Error: Cannot parse AS2 MessageID

Hi Guys，

I'm configuring AS2 adapter sender channel from B2B Toolkit. I received below error:

Cannot process an HTTP request to servlet [AS2DispatcherServlet] in [AS2] web application.
[EXCEPTION]
javax.servlet.ServletException: AS2 adaper is not running: java.lang.RuntimeException: Cannot parse AS2 MessageID <HostName_DE0AF96A-5DAF-483A-8A39-EB57816D74E5>
at com.sap.aii.adapter.as2.servlet.AS2DispatcherServlet.doPost(AS2DispatcherServlet.java:174)
at...

When I tried using different AS2 client and the same sender channel works. The only difference I can spot is that AS2 message ID format.

Working AS2  message ID has to format of xxxxx@xxxxxx.

My question is whether the sender channel can only parse the AS2  message ID containing symbol @?

Looking at the sender channel configuration, I do notice you need to enter Expected MessageID left and Expected MessageID right fields. I use .*  for both fields at the moment.

Any ideas?