The best way to get the name of a query service is using the transaction GENIL_MODEL_BROWSER . If you don't find out what you need there then just set a break-point in the method GET_INSTANCE, in classes:
When you add custom value nodes, some times they dont apear in 'Available fields' list in Configuration. This is because, in design layer the field (or <DEFAULT> setup) has got 'Hidden' field set.
You can try setting Design Layer in below links.
SPRO -> CRM -> UI framework -> Design Layer
For LORD ERP, see 'Define eference Design objects'