Set any XML in any element Supplementary Data

[aerepository]

Hi, would you give us example how to set our own XML object in any element in Supplementary Data Envelope?

I have give it a try and this shows up on log:

`2022-12-27 07:57:01.069 ERROR 8395 --- [nio-8080-exec-2] c.p.swift.model.mx.MxWriteImpl : Error writing XML:javax.xml.bind.MarshalException

• with linked exception:
  [com.sun.istack.SAXException2: unable to marshal type "com.test.iso.CustomSupplementary" as an element because it is not known to this context.]`

Thank you