Symptoms
You enable Business Activity Monitoring (BAM) tracking in Microsoft BizTalk Server. When you try to process a message, a byte order mark (BOM) is added unexpectedly to the message.
Resolution
Cumulative update information
The fix that resolves this issue is included in the following cumulative update for BizTalk Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about service pack and cumulative update list for BizTalk Server. Learn about BizTalk Server hotfixes and cumulative update support.