Some requirements must be fulfilled in every case, such as payment of the filing fee (point 534
) and specification of the documents on which processing in the European phase is to be based (points 473
ff). Further, as a rule, the designation fee is due and the request for examination must be filed at expiry of the 31-month time limit for entry into the European phase, unless the ISR was published extremely late (see points 549
). However, the filing of a translation, for instance, is required only if the international application was not published in an official language of the EPO (points 509
ff). This means that for each application the applicant must verify which requirements are to be fulfilled within the 31-month time limit.