The WCF-SAP NCO adapter does not log any error message when it receives an IDOC that contains fields that are longer than the allowed length.
When the IDOC is transferred to SAP, the fields are misaligned when the IDOC is processed. This issue occurs because the WCF-SAP NCO adapter does not validate the created IDOC against the IDOC schema.
Cumulative update information
For BizTalk Server 2016
The fix that resolves this issue is included in Cumulative Update 5 for BizTalk Server 2016.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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.