No it return that, what i have inserted as `id` into the proxy.
When creating a proxy i have just two parameters: the className and a id. The id is a readable and fix property on the proxy object. When i insert the uuid instead the id, this will be returned by `determineDocumentId()`. The `refreshDocumentForProxy()`method will redo the right properties. The only stomach ache i still got is now: does the new document got the right id = absPath now?