2.3 Language for the purpose of the international preliminary examination
2.3.2 Language of the amendments
Any amendments filed during international preliminary examination must be submitted in the language of proceedings before the EPO as IPEA. If they are initially not submitted or published in that language, the applicant must file a translation (see A‑VII, 3.1).
For details on the language to be used in the case of rectification, see A‑VII, 3.1
Rule 55.3 PCT
WIPO PCT Guide 10.055