These Regulations implement the requirements of Directive 2014/55/EU of the European Parliament and of the Council of 16th April 2014 on electronic invoicing in public procurement (OJ No L 133, 6.5.2014, p.1-11)(“the Directive”) which extends the EEA by virtue of the Decision of the EEA Joint Committee No. 166/2015 of 11 June 2015 (OJ No L 341, 15.12.2016, p.65). These Regulations also make minor amendments to the Public Contracts Regulations 2015 and the Concession Contracts Regulations 2016.
Link: The Public Procurement (Electronic Invoices etc.) Regulations 2019
Source: Legislation .gov.uk