Since the search for conflicting applications that are not published at the time of the initial search is completed either during Chapter II in case a demand is filed or during the European phase, the documents which can be cited in the search report do not include unpublished patent applications (see GL/PCT‑EPO B‑VI, 4.1).
Source: http://www.epo.org/law-practice/legal-texts/html/guidelinespct/e/b_ix_2_2.htm
Date retrieved: 17 May 2021