GL199-final closed periods back to limit-close

My users accidentally final-closed periods FY17 periods 1-12 while. They try to run the GL199 but the system won't let them change the FY17 periods back to limit-close. I put a ticket with Lawson but unfortunately there is no way for the system to undo a Final Closed period. They suggested a resolution but it's out of their scope and will be use at our own discretion. Do you know another way to do this?