As the Preparer for Account Certification, you can work on the Account Certification until you press Submit and send it forward to the Approver. If for some reason you find that an Account Certification is no longer available to you, but you still need to work on it, the only option is to have the Approver send it back to you. Unfortunately, the Central Finance Account Certification team cannot step in and send the Account Certification back to you. You will need to contact the Approver, and ask them to open the Account Certification and select the Send Back button.