4. Where the criteria and rules for qualification referred to in paragraph 2 include requirements relating to the economic and financial capacity of the economic operator, the latter may where necessary rely on the capacity of other entities, whatever the legal nature of the link between itself and those entities. In this case the economic operator must prove to the contracting entity that these resources will be available to it throughout the period of the validity of the qualification system, for example by producing an undertaking by those entities to that effect. Under the same conditions, a group of economic operators as referred to in Article 11 may rely on the capacity of participants in the group or of other entities. |