Normally, priority need only be checked if a relevant P or E document is found during the search. However, there may also be cases where the examiner immediately realises that the priority is not valid (e.g. in the case of an alleged doublure (see GL/PCT‑EPO B‑IV, 1.1) or a continuation-in-part (see GL/PCT‑EPO F‑VI, 1.4)). Also, in case of restoration of priority rights, the examiner may insert a comment in Box II (see GL/PCT‑EPO B‑XI, 4.1).[GL/ISPE 17.28; 17.29; ]

4.1 Restoration of priority

4.2 Use of "P" documents in the written opinion

4.3 Use of "E" documents in the written opinion