Where a time apportionment method is used that method must be at least as accurate as the '24ths basis' of premium income recognition, except for reinsurers for which transactions are only recorded every quarter where the method used must be at least as appropriate as the 1/8th basis. Where a time apportionment method is deemed inappropriate due to uncertainty in the period of insurance, such as for marine cargo, the method used must be disclosed in the actuarial report required as per Chapter AA-4.