I already asked in #C29J1BPM3 but maybe this is a better place? If you delete a revenue arrangement without first deleting the revenue elements, how do you delete the orphaned elements?

Been quite a while since I've dealt with ARM, but IIRC there's a batch process that deletes those. I think it runs on mostly the same schedule as the Update Arrangements process.

if you delete an revenu arrangement it will delete the revenu elements.

They automatically disappeared about an hour later, so it does seem to be a scheduled batch process.