As far as I know, this is now working. I had exchanged some private messages with oaslan, this was one of my last messages:
"I got it working now. If you try thing NesquikScoringTest (either service, predictStrength, prescribeStrength) then those should work. The problem was that you had underscores at the beginning of field names in your code, however the fields defined in the model (in Analytics Builder, Model > View > Model Details) do not have an underscore at the beginning. So I created a new datashape (NesquikDS2) and in the template I referenced this datashape instead. I created new entities (NesquikDS2, AnalyticsHelperScoringTest, NesquikScoringTest) and did not change your entities."