If the RNIF disassembler encounters an error condition when you disassemble an RNIF-formatted message, it generates an error message that's subsequently logged to the event log by the BizTalk runtime. Details about the error, including a specific description of the error condition, aren't written to the event log correctly. After you apply Cumulative Update 1 (CU1) for Microsoft BizTalk Server 2016, the error details will be included in the message that's written to the event log.
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:
For more information about BizTalk Server hotfixes, click the following article number to view the article in the Microsoft Knowledge Base: