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When an intermediate document (iDOC) is sent from Microsoft BizTalk Server to SAP through the .NET Connector (NCo), you may notice that the iDOC segment hierarchy is missing, and data is misaligned when it is received in SAP. Additionally, you may notice that the iDOC that is received in SAP contains an error message that resembles the following:

Extension # is unknown


This issue is fixed in the following cumulative updates for BizTalk Server:

        Cumulative Update 7 for BizTalk Server 2013 R2

        Cumulative Update 5 for BizTalk Adapter Pack 2013

        Cumulative Update 3 for BizTalk Server 2016


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, 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


Third-party information disclaimer

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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