Consider the following scenario:

  • You apply the SWIFT Message Pack on Microsoft BizTalk Server.

  • You try to process a service message that has a type indicator of 21.

In this scenario, you may receive the following error message:

Publishing failed message to MessageBox. Details: The single message of type S21_FIN_ACKNAK, whose Interchange ID is {InterchangeID}, has been marked as A4SWIFT_Failed=True in the MessageBox database by the SWIFT Disassembler.

This message failed with 0 parse errors, 1 XML validation errors, and 0 BRE validation errors.

Error details can be extracted from the failed message in the MessageBox database by subscribing to messages where A4SWIFT_Failed=True.


This issue occurs because the MTS21_FIN_ACKNAK.xsd schema in the Microsoft.Solutions.FinancialServices.SWIFT.FrrSchemas.dll file of Message Pack requires the message to have a trailer block. However, the service message that has a type indicator of 21 does not have a trailer, and the SWIFT User Handbook indicates that the trailer block is optional for this message type.

Cumulative update information

The fix that resolves this issue is included in Cumulative Update 2 for SWIFT Message Pack 2015.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!