Where the description is filed by reference to a previously filed application (see A‑II, 4.1.3.1) and the latter is not in an official language of the EPO, the applicant must also file a translation into one of those languages within two months of the date of filing.[Rule 40(3); ]
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/a_vii_1_2.htm
Date retrieved: 17 May 2021