You are in the right track,May be the node is not valid or something is messingup when creating the node.Check the Error.log in the ISAdminconsole webpage.
Once you have created node (check this in the pipeline) nextstep will be
XMLNodeToDocument (input parameters will be node,set makeArrays=false,documentTypeName=fullyqualifiedname (this is optional))
then you will see the output document in the pipeline.
If possible upload the screen shot of your mapping or the sample package with existing logic)so that it will be easy to resolve solve
HTH,
#webMethods#Flow-and-Java-services#Integration-Server-and-ESB