Holacracy Community of Practice Archive, 2015-2019 Community Holacracy Web Site

Aside from terminating partnership, I'd suggest a consequence with real impact/teeth - like lowering someone's pay, or something like that.  Obviously be careful you're within your contract terms with the person, and any relevant laws.  But honestly, if someone has a pattern of willfully ignoring the formal authority structure of the organization, termination is probably in order - just like you'd do in a management hierarchy if someone repeatedly and willfully ignored CEO mandates...