GA E XIII 3 Filing a translation of the priority document or the declaration

Where the priority document is not in English, French or German, and the validity of the priority claim is relevant for determining whether the invention concerned is patentable, a translation in one of these languages must be submitted at the invitation of the EPO. If a translation is already available to the EPO, it will not issue an invitation. 
The translation need not necessarily be in the language of the proceedings as long as it is in English, French or German (see point 422).
Where the international application is a complete translation of the previous application, a declaration to that effect is sufficient and no invitation to file a translation will be issued (Form 1200, Section 7.3). This means that if the priority application is, for instance, a national application filed in Spanish, the applicant may declare that his international application filed in, for instance, English is a complete translation of the Spanish priority application. A translation from Spanish into an official language of the EPO is in that case not required. 
A translation of the priority document may also be requested where the application was filed (in part) on the basis of incorporation by reference. 

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EPC Implementing Rules

EPO Guidelines - A Formalities Examination

EPO Guidelines - F The European Patent Application

EPO Guide for Applicants, part II Int.

EPO Guide for Applicants, part II Int. - E Euro-PCT procedure before the EPO as designated or elected Office

PCT Implementing Rules