The procedure under Rule 56 allows the applicant to file missing drawings or parts of the description subsequently, and to rely on the priority document in order to avoid re-dating of the application to the date of filing of the missing parts. Under Rule 56(3), re-dating is only avoided where the missing parts were "completely contained" in the priority document (see C‑III, 1 and A‑II, 5). The provisions of Rule 56(3) apply only to the filing stage of the application, without further implications: in particular, it is not permissible at later stages of the procedure to rely on the priority documents to correct or amend the application as filed (in keeping with G 3/89 and G 11/91). For Euro-PCT applications a similar provision exists under Rule 20.6 PCT, whereby a review by the EPO as elected or designated Office is possible under Rule 82ter PCT.
Missing parts of the description and/or missing drawings allowed under Rule 56(3) are always considered to be part of the application documents "as originally filed".