Extension fields in web services

Good morning everyone,

I am new to SCN so please excuse me if I do it wrong. I have a question about adding extension fields in web services in C4C.

Before starting a new discussion, I have check threads "http://scn.sap.com/message/16010182#16010182".

I manage to add fields of an existing node of my xbo in web services ("root" of "CustomerQuote" for example) but I don't know how to add a collection of fields of my xbo in web services. When I try to create an extension scenario on my custom node (with my collection of fields), I have error message "No scenarios found". Do you know how should I do please?

Thanks in advance.

Regards.

Maurin