The tender will clearly identify the division of tasks amongst the different members of the  group. Any change in the composition of the group during the procurement procedure or after the  signature of the contract may lead to the rejection of the tender or to the termination of the  contract by the contracting authority, respectively. The group will not be required to adopt a specific legal form in order to submit a tender.  The contract shall be signed by all legal entities or, through a power of attorney to be  attached to the contract, by the leader duly authorised to bind the group and each of its  members.  "Subcontractor" means an economic operator that is proposed by a tenderer or contractor to  perform part of the contract. Subcontracting is allowed but the contractor will retain full liability towards the contracting  authority for the implementation of the contract. Tenderers must give an indication of the tasks that they intend to subcontract and are required  to identify all subcontractors whose share of the contract is above 10 %.  The subcontractors whose share of the contract is above 10 % must comply with the same  exclusion criteria applicable to tenderers. If the subcontractors' capacity is necessary to fulfil the selection criteria applicable to  tenderers, they shall submit the relevant documentary evidence.  Any change in subcontracting during the procurement procedure or after the signature of the  contract may lead to the rejection of the tender or to the termination of the contract,  respectively. During contract execution, the change of any subcontractor identified in the  tender will be subject to prior written approval of the contracting authority (see art.II.10 of  the framework contract). Subcontracting  4.2. 5. ELIGIBILITY OF ECONOMIC OPERATORS  Access to public procurement  5.1. Participation in this tender procedure is open on equal terms to all natural and legal persons  whose domicile (natural person) or whose registration of their headquarters (legal persons) is:  $^{1}$   Please check the list of countries at: https://www.wto.org/english/tratop_e/gproc_e/memobs_e.htm. 5  - in one of the European Union Member States; - in a third country which has a special agreement with the European Union in the field  of public procurement  on the conditions laid down in the agreement ;  - in a country registered as a signatory of the Government Procurement Agreement  (GPA) concluded within the WTO$^{1}$ 