[This is an extended version of the comment previously posted on Albert's personal blog http://howtocrackanut.blogspot.co.uk/2013/03/with-little-help-from-my-friends-ag.html].
According to the current rules on public procurement (mainly, Directive 2004/18) undertakings interested in tendering for a given contract may be subjected to certain personal, financial, professional and technical selection requirements. In order to ensure maximum possible participation in a given tender, the rules in articles 47(2) and 48(3) of Directive 2004/18 expressly indicate that ‘An economic operator may, where appropriate and for a particular contract, rely on the capacities of other entities, regardless of the legal nature of the links which it has with them’ (emphasis added).
The Italian rules transposing Directive 2004/18 [ie Article 49(6) of Legislative Decree No 163/2006] provided that
‘[f]or works contracts, the tenderer may rely on the capacities of only one auxiliary undertaking for each qualification category. The invitation to tender may permit reliance on the capacity of more than one auxiliary undertaking on account of the value of the contract or the special nature of the services to be provided, subject to the prohibition on the shared use by the tenderer of the individual economic, financial, technical and organisation capacities […]’ (emphasis added).
A challenge was brought against the Italian provisions on the basis that the default rule that restricted the number of ‘auxiliary undertakings’ to one, save in exceptional circumstances, unduly limited the freedom of undertakings to rely on third parties when deciding to tender for public contracts. The competent Italian court submitted a reference for a preliminary ruling to the CJEU in order to clarify the compatibility of the domestic rules with those of the public procurement directive.
In his Opinion of 28 February 2013 in case C-94/12 Raggruppamento Temporaneo Imprese (‘RTI’), Advocate General Jääskinen has clearly indicated that the rules of arts 47(2) and 48(3) of Directive 2004/18 preclude national legislation which prohibits, except in special circumstances, reliance on the capacities of more than one auxiliary undertaking in order to fulfil the selection criteria concerning the economic and financial standing and/or technical and/or professional ability of an economic operator tendering for a contract as main contractor.

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