My guess is that the object isn’t committed and the label is trying to retrieve from the db, hence hitting a null exception.
I suggest using a data view for the related course entity, which you populate via association. Then in that view you can place the label that references the title attribute.
Hope this helps
Uh-oh, the same error occurs on the TrainingEvent_Overview to Registrations button. I didn't manage to fix that one, where the Title should contain a Name from Course and a Date from TrainingEvent_Registration - I cannot pick the correct entity in the Connect-tab. So I imported the file from the Resources tab in Module 6, but this source gives the same error! Support says there's no bug in the source, so now I'm lost again…
Anyone else have this problem? Or is it best to create a new Question for this?