(40)In order to avoid double counting of own-funds between the insurance and banking sectors at individual level, insurance and reinsurance undertakings should deduct from the amount of basic own funds any participations in financial and credit institutions in excess of 10 % of the Tier 1 own-fund items which are not subject to any limit. Participations in financial and credit institutions that in aggregate exceed the same threshold should be partially deducted on a proportional basis. The deduction is not necessary where the participations are strategic and method 1 set out in Annex I to Directive 2002/87/EC is applied to these undertakings for the group solvency calculation.