Symptoms
When a host instance is receiving IDOCs from multiple SAP servers in Microsoft BizTalk Server 2016 or 2020, some IDOCs may be missing or duplicated.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Resolution
This problem is fixed in the following cumulative updates for BizTalk Server:
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Cumulative Update 1 for BizTalk Server 2020
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Cumulative Update 6 for BizTalk Server 2016
References
For information about the service packs and cumulative update list for BizTalk Server, see the following article in the Microsoft Knowledge Base:
2555976 Service Pack and cumulative update list for BizTalk Server
For more information about BizTalk Server hotfixes, see the following article in the Microsoft Knowledge Base:
2003907 Information about BizTalk hotfixes and Cumulative Update 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.