EUOSHA/2021/OP/F/SE/0142  3  General information on tendering  3.1  Legal basis  3.2  Rules on access to procurement  3.3  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). 2 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 EU 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 3  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 (in the case of a joint tender, the country of establishment of each group member) and  must present the supporting evidence normally acceptable under the law of that country/countries. The  same document(s) could be used to prove country/countries of establishment and the delegation(s) of  the authorisation to sign as described in  section 4.2 . 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  calls for tenders or proposals (participants). On registering, each participant obtains a Participant Identification Code (PIC), a nine-digit number, which  acts as their unique identifier in the Participant Register. A participant needs to register only once — the  2  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, 30.07.2018, p.1).  41 