1. Member States shall ensure that the competent authorities referred to in Articles 8, 13, 14, 15, 18, 20 and 22 cooperate with each other whenever necessary for the purpose of carrying out their functions and duties or of exercising their powers under the national provisions transposing this Directive. Those competent authorities shall also coordinate their actions in order to avoid possible duplication and overlap when applying supervisory powers and administrative penalties and remedial measures to cross-border cases.