I cannot highlight that my employee is an apprentice (the tick box isn't available to me)..What do i need to do so that this becomes available?

Clicking on Employee Info then Employment Details brings up a series of boxes to be completed such as Location / Division etc. I need to click on the "Apprentice?" box however am unable to access this when enrolling apprentices on to Fourth. Therefore this creates issues with NMW etc if this box physically cannot be ticked. All settings have been reviewed by our Administrator and we cannot fathom why i do not have access to select this.