Rule 137(5) sets out two further conditions for amendments to claims, namely that amended claims may not relate to (i) unsearched subject-matter which does not combine with the originally claimed invention or group of inventions to form a single general inventive concept and (ii) subject-matter not searched in accordance with Rule 62a and Rule 63 (see, however, H‑II, 5).
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/h_ii_6.htm
Date retrieved: 17 May 2021