Before the date of application of Regulation (EU) 2023/2533, the procedure in Regulation (EU) 392/2012 applies. The procedure in EN 60704-3 is not included in the citation of harmonised standards for Regulation (EU) 392/2012. The citation refers to EN 60704-2-6:2012, but it specifically mentions that the clause that cross-references to EN 60704-3 is not part of the citation: "Clause 1.101 on standard deviation for declaration and verification is not part of the present citation.
As from the date of application of Regulation (EU) 2023/2533, the procedure in standard EN 61121 applies. The latest version of this standard shall contain a reference to the applicable provisions of EN 60704-2-6:2012 and does not contain any reference to EN 60704-3.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.