Under Art. 123(2) it is impermissible to add to a European application matter present only in the priority document for that application (see T 260/85), unless this is done under the provisions of Rule 56(3) (H‑IV, 2.3.2). For correction of errors, see H‑VI, 4.
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/h_iv_2_2_5.htm
Date retrieved: 17 May 2021