The cash flow projections used in the calculation of best estimates for life insurance obligations shall be made separately for each policy. Where the separate calculation for each policy would be an undue burden on the insurance or reinsurance undertaking, it may carry out the projection by grouping policies, provided that the grouping complies with all of the following requirements:
(a) there are no significant differences in the nature and complexity of the risks underlying the policies that belong to the same group;
(b) the grouping of policies does not misrepresent the risk underlying the policies and does not misstate their expenses;
(c) the grouping of policies is likely to give approximately the same results for the best estimate calculation as a calculation on a per policy basis, in particular in relation to financial guarantees and contractual options included in the policies.