If an XML pipeline is configured to use schema validation in Microsoft BizTalk Server 2010, it may not validate all XML messages after you install BizTalk Server 2010 Cumulative Update 7 (CU7).
Note This issue also occurs in BizTalk Server 2013 after you apply BizTalk Server 2013 Cumulative Update 2 (CU2).
Cumulative update information
This issue was first fixed in the following cumulative update of BizTalk Server:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For information about the service packs and cumulative update list for BizTalk Server, see KB 2555976: Service pack and cumulative update list for BizTalk Server.
For more information about BizTalk Server hotfixes, see KB 2003907: Information about BizTalk hotfixes and cumulative update support.