Where insurance and reinsurance undertakings have insufficient data of appropriate quality to apply a reliable actuarial method, they may use appropriate approximations to calculate the best estimate provided that all of the following requirements are met:
((a))(a) the insufficiency of data is not due to inadequate internal processes and procedures of collecting, storing or validating data used for the valuation of technical provisions;
((b))(b) the insufficiency of data cannot be remedied by the use of external data;
((c))(c) it would not be practicable for the undertaking to adjust the data to remedy the insufficiency.