It could be that I just misunderstood the nature of SCORM packages.. I have managed to get scores from a quiz to transfer, but only this. Completion / No completion of progress is also registered, but not quite measured as a percentage in any way, and I can't do much with this on Moodle.
This video from 4 years ago helped me
www.youtube.com/watch?v=XDF1WjhQ90U . The author makes (still) valid points that:
- only quizzes (and not, e.g. pages or - alas! - any of the other "interactivity" components can be tracked for scores)
- only one quiz (with multiple questions) can be used in a SCORM Learning Object generated by Xerte.
This is as far as I have got, and for the moment I must quit further testing.
Many thanks for all the assistance.
Przemek