See ISPE Guidelines 4.05. The EPO applies option GL/ISPE A4.05[1] of the Appendix to Chapter 4 of the ISPE Guidelines.[Rule 5.1(a)(ii); ]
Source: http://www.epo.org/law-practice/legal-texts/html/guidelinespct/e/f_ii_4_3.htm
Date retrieved: 17 May 2021