My understanding is that if the aircraft is on the AOC, it must be operated in accordance with the AOC requirements, i.e. you must follow the rules of the approved Operations Manual which will include the limitations of the approved operating area. If your employer want you to fly outside the AOC area, it should apply to your regulatory authority who may require particular conditions to be implemented to ensure safe operation. This will probably require more paperwork in the form of an Ops Manual instruction for the operation in mind.