BIP5428
Severity
20 : ErrorMessage
The bitstream does not contain the required Message Key, Message Identity or Message Path for a nested message.Explanation
The TDS parser could not find the Message Key or Message Identity for a nested message in the bitstream. It also could not identify the nested message using a Message Path.Response
Make sure that the incoming upper level message is a consistent message under the TDS message definition or define a Message Path to identify the nested message.