(12)When making that determination, competent authorities should have regard to the principle of proportionality. In cases where there are alternative ways of satisfying the obligation laid down in Article 5(1) of Directive 2003/71/EC through the disclosure of different kinds of supplementary financial information, or the presentation of that information in different formats, the competent authority should not require the issuer to satisfy that obligation in a way that is more costly or onerous than an adequate alternative.