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Guide for applicants, Part 2: PCT procedure before the EPO (Euro-PCT Guide)

Translation of the international application
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.
WIPO PCT Guide 10.011-10.013 
OJ 1993, 540
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 the international preliminary examination will be carried out on the basis of the translation already furnished for the purposes of international search (see point 205).
Any amendments to be taken into account for the international preliminary examination must be submitted in the language of proceedings of the procedure before the EPO as IPEA. If they are initially not submitted in that language, the applicant must file a translation.  
WIPO PCT Guide 10.055