Sounds as if there is some business danger visible. I second that, if you had an aviation compliant system set in place, the question should never appear. During the course of certification and audit you must have set up a quality system to be allowed to sign off certificates. So, you must have some kind of written processes how, when and who is signing papers, together with an audit proof list of currently trained and official people allowed to sign certificates. I assume you are only not aware of the procedures set by the company and should ask for further education by management ;-).