In the search phase, under Rule 137(1) amendments to the claims are not admissible before the applicant receives the European search report, and therefore no auxiliary requests can be submitted. If auxiliary requests are submitted before the establishment of a supplementary European search report (see H‑II, 2.1), only the main request will be taken into account in the search (see, however, B‑VIII, 3.2.2, and B‑VIII, 4.2.2).
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/h_iii_3_2.htm
Date retrieved: 17 May 2021