The “Next Check Number” is set through Bank Setup but it can also be incremented when paying vouchers. If the other offices are writing checks using the same checking account (Bank Code), changing the check number during the check run will increment the numbers in the Bank Account File.  They will not be able to change them without affecting the Bank Account File in AP Manager.  You can prevent them from making changes through Tools in AP Manager by changing the security settings in OrionAdmin, but, if they have access to pay vouchers they will be able to change the number when printing the checks and it will affect the numbering in the Bank Account File.