Request for a preliminary ruling from the Naczelny Sąd Administracyjny in the case Aviva. Is a provision of national law concerning the exemption from VAT of independent groups of persons which does not lay down any criteria or procedures governing the fulfilment of the condition of distortion of competition compatible with Article 132(1)(f) of Council Directive 2006/112/EC of 28 November 2006 on the common system of value added tax in conjunction with Article 131 of the VAT Directive, and also with the principles of effectiveness, of legal certainty and of the protection of legitimate expectations?
C-605/15
0