Where the processing of personal data takes place in the context of the activities of an establishment of a controller or a processor in the Union and the controller or processor is established in more than one Member State, or where processing taking place in the context of the activities of a single establishment of a controller or processor in the Union substantially affects or is likely to substantially affect data subjects in more than one Member State, the supervisory authority for the main establishment of the controller or processor or for the single establishment of the controller or processor should act as lead authority.
I gcás ina ndéantar sonraí pearsanta a phróiseáil i gcomhthéacs gníomhaíochtaí bunaíochta de chuid rialaitheora nó próiseálaithe san Aontas agus i gcás ina bhfuil an rialaitheoir nó an próiseálaí bunaithe i mBallstát amháin nó níos mó, nó i gcás ina ndéanann an phróiseáil a dhéantar i gcomhthéacs gníomhaíochtaí bunaíocht aonair de chuid rialaitheora nó próiseálaithe difear suntasach do na hábhair sonraí i níos mó ná Ballstát amháin, nó ar dócha go ndéanfaidh sé difear suntasach dóibh, is é an t-údarás maoirseachta do phríomhbhunaíocht an rialaitheora nó an phróiseálaí nó do bhunaíocht aonair an rialaitheora nó an phróiseálaí ar cheart dó gníomhú mar phríomhúdarás.