Symptoms
When you try to receive an Applicability Statement 2 (AS2) message together with Message Disposition Notification (MDN) in a Microsoft BizTalk Server environment, you may notice that some incoming messages show a NULL value in the MessageDateTime column.
Resolution
This issue is fixed 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
For information about the service packs and cumulative update list for BizTalk Server, click the following article number to view the article in the Microsoft Knowledge Base:
2555976 Service pack and cumulative update list for BizTalk Server
For more information about BizTalk Server hotfixes, click the following article number to view the article in the Microsoft Knowledge Base:
2003907 Information about BizTalk hotfixes and Service Pack support