(129)The calculation of the best estimate of technical provisions at the level of the group in accordance with method 1 (accounting consolidation-based method) should be based on the assumption that the sum of the best estimate of the participating insurance or reinsurance undertakings and a proportional share of the best estimate for its related undertakings, each adjusted for intra-group transactions, is approximately the same as the amount that would result from calculating the best estimate for the consolidated insurance and reinsurance obligations at the level of the group in accordance with Articles 75 to 86 of Directive 2009/138/EC. In particular, where best estimates of third-country insurance or reinsurance undertakings are used in that calculation, those best estimates should be assessed in accordance with those Articles.