The Code of good practice on referendums recommends that:

" In order to avoid having to declare a vote totally invalid, an authority must have the power, prior to the vote, to correct faulty drafting, for example:
i. when the question is obscure, misleading or suggestive;
ii. when rules on procedural or substantive validity have been violated; in this event, partial invalidity may be declared if the remaining text is coherent; subdivision may be envisaged to correct a lack of substantive unity."