Symptoms
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).Resolution
Cumulative update information
This issue was first fixed in the following cumulative update of BizTalk Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
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.