Tree Example in WebDynpro Documentation has erros?

Hello,

I try to figure out how a tree works and started to build the example from the documentation.

I wonder how this example could ever been working? I have NetWeaver 6.40 SP12 plus NWDS 6.40 SP12.

Short example from documentation:

IPrivateNonRecursiveTree.ICustomerElement customer = customerNode.createCustomerElement();

       customer.setId("Customer No:" + i);
       customerNode.addElement(customer);

       IPrivateNonRecursiveTree.IOrderNode orderNode = customer.nodeOrder();

When I try to insert that part of code I get an error at:

customer.nodeOrder();

I can do:

customerNode.nodeOrder()

They try to get a node from an element, that is not supported at least in my NWDS?! Is there something new or no longer supported?

I would at least assume that all pieces of code are tested at least once. It is not the first time I found obvious errors in example source code. That is not an appropriate level of quality of documentation.

Best regards,

Frank