Ok thanks, that has brought me through the syntax check. But now I get

Error Type:
Microsoft VBScript runtime (0x800A01B6)
Object doesn't support this property or method
/SAPReceiveIDOC/XML-izeRequesttoHTTP.asp, line 41

and line 41 is the line that reads
oPI = objXMLdoc.createProcessingInstruction("xml", "version=""1.0""
encoding=""UTF-8""")

I moved it up by the way as a child of the top node, as you suggested.

My piece of code is now like this:

-------------

set objXMLdoc = Server.CreateObject ("MSXML2.DOMDocument.3.0")

objXMLdoc.async = False
objXMLdoc.validateonParse = false
objXMLdoc.preserveWhiteSpace = false
objXMLdoc.resolveExternals = false

Dim oPI
oPI = objXMLdoc.createProcessingInstruction("xml", "version=""1.0""
encoding=""UTF-8""")
objXMLdoc.appendChild(oPI)

' ------------------ Create the root node named Message
set objXMLroot = objXMLdoc.createElement("Message")
objXMLdoc.appendChild(objXMLroot)

--------------

So there are 2 children on the top level. Is that how this should be
done ?
What can this error be ?

Jo