2. GENERAL INFORMATION ON TENDERING  2.1. Legal basis  2.2. Rules on access to procurement  2.3. Registration in the Participant Register  This call for tenders is governed by the provisions of Regulation (EU, Euratom) 2018/1046 of  the European Parliament and of the Council of 18 July 2018 on the financial rules applicable to  the general budget of the Union (the Financial Regulation)$^{18}$.  The  Contracting authority  has chosen to award the contract resulting from this call for tenders  through an open procedure pursuant to Article 164(1) (a) of the Financial Regulation. In an open  procedure any interested economic operator (any natural or legal person who offers to supply  products, provide services or execute works) may submit a tender.  Participation in this call for tenders is open on equal terms to all natural and legal persons  coming within the scope of the Treaties, as well as to international organisations. It is also open to all natural and legal persons established 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 that agreement. Where the Agreement on Government Procurement$^{19}$ concluded within  the World Trade Organisation applies, the participation to this call for tenders is open to all  natural and legal persons established in the countries that have ratified this Agreement, on the  conditions laid down therein.  The rules on access to procurement do not apply to subcontractors. Subcontracting may not be  used with the intent to circumvent the rules on access to procurement.  To enable  the Contracting authority to verify the access, each tenderer must indicate its  country of establishment (and in case of joint tender – the country of establishment of each  group member) and must present the supporting evidence normally acceptable under the law  of that country/-ies. The same document(s) could be used to prove country/-ies of  establishment and the delegation(s) of the authorisation to sign as described in  Section 4.3 . Any economic operator willing to submit a tender for this call for tenders must be registered in  the Participant Register - an online register of organisations and natural persons participating in  European Commission's calls for tenders or proposals (participants). $^{18}$ Regulation (EU, Euratom) 2018/1046 of the European Parliament and of the Council of 18 July 2018 on the financial rules applicable to  the general budget of the Union, amending Regulations (EU) No 1296/2013, (EU) No 1301/2013, (EU) No 1303/2013, (EU) No 1304/2013,  (EU) No 1309/2013, (EU) No 1316/2013, (EU) No 223/2014, (EU) No 283/2014, and Decision No 541/2014/EU and repealing Regulation  (EU, Euratom) No 966/2012 (OJ L 193 of 30.07.2018, p.1).  $^{19}$ https://www.wto.org/english/tratop_E/gproc_e/gp_gpa_e.htm.  24