In order to verify the criteria of Art. 123(3) the examining or opposition division needs to compare the text of the amended claims with the claims of the patent as granted or as amended in opposition or earlier limitation proceedings, whichever claims are the most recent in force.
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/h_iv_3_3.htm
Date retrieved: 17 May 2021