I'm not sure if I'm missing something simple here - when creating a mobile app, how would I display a list of records with data from a database entity as well as a local entity? For example (keeping it simple): I may have a server entity with some general contact information, and a local entity with favourite contact info (i.e. ContactId and IsFavourite). How would I then only retrieve and display the "favourite" contacts in a list.
I suggest that you use a Data Action to fetch only the favorite contacts. For example: place a local variable on your screen having the list of favorite contact ids and use that list to filter the contacts returned by the data action. This way only the contacts you want will be returned (and travel in the network).