My responsibilities as the accounting officer are laid out in section 16 of the FAA. With respect to some of the findings that you're referring to, those are delegated down into the organization. Ultimately, the person who signs off on section 34 of the FAA is attesting to the fact that the goods or services have been received. Whoever has that delegated authority and the manager who oversees that person are the people responsible for those decisions, based on the delegations that have been given to them and the requirements under the FAA.
Evidence of meeting #122 for Public Accounts in the 44th Parliament, 1st session. (The original version is on Parliament’s site, as are the minutes.) The winning word was documents.
A video is available from Parliament.