(23)In the case of completely new types of securities which cannot be covered by the existing schedules or any of their combinations, the issuer should still have the possibility to apply for approval for a prospectus. In those cases he should be able to discuss the content of the information to be provided with the competent authority. The prospectus approved by the competent authority under those circumstances should benefit from the single passport established in Directive 2003/71/EC. The competent authority should always try to find similarities and make use as much as possible of existing schedules. Any additional information requirements should be proportionate and appropriate to the type of securities involved.