After receiving the European search report and the search opinion, the applicant must respond to the search opinion (see B‑XI, 8) and may, in his reply and of his own volition, amend the description, claims and drawings (see C‑II, 3 and subparagraphs, and C‑III, 3.2). Likewise, for applications for which no supplementary European search report is prepared (see B‑II, 4.3) when entering the European phase from the PCT, the applicant is required to respond to the WO-ISA, IPER or SISR where the ISA and, if applicable, the IPEA or SISA was the EPO (see E‑VIII, 3.1 and E-VIII, 3.2). This response to the WO-ISA, IPER or SISR may include amendments made by the applicant of his own volition to the description, claims and drawings. Thereafter, the applicant may amend the application only with the consent of the Examining Division.
it is after receipt of the first communication from the examiner in examination proceedings that the applicant may "of his own volition, amend once the description, claims and drawings", provided that the amendment and his reply are filed within the time limit for replying to that communication.