BIP5519
Severity
20 : Error
Message
An attempt has been made to deploy a Message Set containing a complex type or group the currently unsupported type composition 'Message'. Message set identifier: <insert_0>, type identifier: <insert_1>.
Explanation
The 'Multipart Messages' feature of the message model is as yet not supported by the parsers and writers. For the moment, therefore, the 'Message' type composition should not be used when defining message sets.
Response
Change the message set so that it does not define any complex types or groups with the type composition 'Message'.