1. Insurance and reinsurance undertakings shall validate the calculation of technical provisions, in particular by comparison against experience as referred to in Article 83 of Directive 2009/138/EC, at least once a year and where there are indications that the data, assumptions or methods used in the calculation or the level of the technical provisions are no longer appropriate. The validation shall cover the following:
(a) the appropriateness, completeness and accuracy of data used in the calculation of technical provisions as set out in Article 19 of this Regulation;
(b) the appropriateness of any grouping of policies in accordance with Article 34 of this Regulation;
(c) the remedies to limitations of the data referred to in Article 20 of this Regulation;
(d) the appropriateness of approximations referred to in Article 21 of this Regulation for the purposes of calculating the best estimate;
(e) the adequacy and realism of assumptions used in the calculation of technical provisions f
…