First i want shortly describe what i want to do: i have a page properties set on my wiki-page. One property is project-number. Now i want to add this project-number as an label.
The following workflow code is not working 
{trigger:statechanged|state=New}
{set-metadata:project-number}@project-number@{set-metadata}
{set-label:{get-metadata:project-number}}
{trigger}
Ideas welcome!