http://support.microsoft.com/kb/905290/

Fix 245451: BRE caches XML fields incorrectly

 

 http://support.microsoft.com/kb/905571/

Fix: 245450: The Rule Engine is not honoring rule priorities correctly in high load

 

http://support.microsoft.com/kb/920136/

FIX: Some Business Rule Engine values in the Windows registry are reset to the default values in BizTalk Server 2004

 

For all the bugs fixed in BTS 2004 SP2, see

http://support.microsoft.com/kb/924330/