Hello,
I would like to have the assignee field mandatory (i.e. issue not unassigned) in all status of the issue, but just not in the backlog. In backlog, we still don't know who will work on it, so we allow an issue to be unassigned.
I could (and I did) set a validator in the transitions to ensure there's an assignee during transition leaving the backlog, but nothing prevents to unassign afterward.
Thanks for your hints.
Michel