2. Member States shall ensure that critical entities have in place and apply a resilience plan or equivalent document or documents which describe the measures taken pursuant to paragraph 1. Where critical entities have drawn up documents or taken measures pursuant to obligations laid down in other legal acts that are relevant for the measures referred to in paragraph 1, they may use those documents and measures to meet the requirements set out in this Article. When exercising its supervisory functions, the competent authority may declare existing resilience-enhancing measures taken by a critical entity that address, in an appropriate and proportionate manner, the technical, security and organisational measures referred to in paragraph 1 as compliant, in whole or in part, with the obligations under this Article.