BAM Line: 321 Message: unknown message

I am getting a Line:321 Message: unknown message on the BAM server. What does this mean?

Was there file locations associated with this event? If you can cut & paste more of the event log it would help in tracking down the issue.

I saw the same on my BAM server:

Level: 0 Time: 2005-10-03 10:13:59 File: businessrules/AccessPoint.cpp Line: 74 Message: Access Point 0a003e500xxx on 169.254.1.5 has checked out
a license
Level: 0 Time: 2005-10-03 10:28:20 File: engineport.cpp Line: 321 Message: Unknown message
Level: 0 Time: 2005-10-03 10:28:22 File: engineport.cpp Line: 321 Message: Unknown message
Level: 0 Time: 2005-10-03 10:28:24 File: engineport.cpp Line: 321 Message: Unknown message

What does this mean?