In cases involving both the controller and the processor, the competent lead supervisory authority should remain the supervisory authority of the Member State where the controller has its main establishment, but the supervisory authority of the processor should be considered to be a supervisory authority concerned and that supervisory authority should participate in the cooperation procedure provided for by this Regulation.
I gcásanna a bhaineann leis an rialaitheoir agus leis an bpróiseálaí araon, ba cheart gurb é an príomhúdarás inniúil maoirseachta i gcónaí údarás maoirseachta an Bhallstáit ina bhfuil a phríomhbhunaíocht ag an rialaitheoir, ach ba cheart údarás maoirseachta an phróiseálaí a mheas mar údarás maoirseachta lena mbaineann agus ba cheart don údarás maoirseachta sin a bheith rannpháirteach sa nós imeachta comhair dá bhforáiltear sa Rialachán seo.