This is the "Navigation_tree_project" template. It should be called in the following format:

{{Navigation_tree_project
|TopContext=
|SuperContext=
|TitleSuperContext=
|ProcessPreload=
|ProcessName=
|ContentPreload=
|ContentName=
}}

example call: {{Navigation_tree_project|TopContext=PR_00019
                                       |SuperContext=PR_00019
                                       |TitleSuperContext=DZH Overleven met kanker
                                       |ProcessPreload=SSM proces voorbeeld
                                       |ProcessName=aanpak
                                       |ContentPreload=SSM content voorbeeld
                                       |ContentName=resultaten}}

Edit the page to see the template text.