If neither the language in which the international application was filed nor the language in which the application was published is one of the official languages of the EPO (English, French or German), the applicant must within the time limit for filing the demand also file a translation in one of these languages with the EPO as IPEA.
OJ 1993, 540
WIPO PCT Guide 10.011
This situation occurs, for instance, if the international application was filed in Spanish, and the Spanish patent office acted as ISA. However, if the international application was filed in Spanish but the EPO acted as ISA, the applicant need not furnish a translation to the EPO as IPEA. In such cases because the international preliminary examination will be carried out on the basis of the translation already furnished for the purposes of international search (see point 204205).
WIPO PCT Guide 10.055
Date retrieved: 24 November 2017