Thank you!
Finally got it to work. I selected 'Not Assessed' and then 'Excluded from...', as I had done about 4 times before.
THEN I noticed the button at the bottom of my screen saying 'DONE' - I hadn't noticed that before and thought, like a database, the employment info would have been automatically saved - except it wasn't! This time, selecting DONE before returning, it did save properly - and payroll worked!
Phew!
