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

Which documents form the basis of the international preliminary examination? - Amendments - Missing parts and elements
The applicant must indicate in Box No. IV of the demand form (PCT/IPEA/401) whether the international preliminary examination is to be based on the international application 
as (originally) filed,  
or whether it should take account of 
amendments to the claims under Article 19 PCT, and/or
amendments to the claims, the description and/or the drawings under Article 34(2)(b) PCT.