Input XML into String

Hello

I followed the below mentioned blog to convert an idoc payload xml into a single string. But it did not work.

Convert the Input xml to String in PI 7.1 using Standard Graphical Mapping

Although , copyxml of the subtree only worked.

When I copied from node to node it worked as it simply created an xml subtree under old node. But when i tried to copy the entire xml from node to string, it did not work.

Can someone clarify whyit is not working.

I even tried creating a simple source xml and target string.

Regards

Sam