https://www.epo.org/en/service-support/faq/law-practice/unitary-patent/translations/do-i-need-file-new-translation
Do I need to file a new translation of the European patent if the claims and description are amended during opposition or limitation proceedings?
In cases where, after registration of unitary effect, an underlying European patent is maintained in amended form during opposition proceedings or limited during limitation proceedings, the proprietor must submit a translation of the amended claims - and the description, if applicable - in the EPO’s official languages other than the language of the proceedings within a period of three months (Rules 82(2) and 95(3) EPC). In such cases, the proprietor does not need to file a new translation of the patent specification in addition to the translation already submitted with the request for unitary effect.
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