The Receiving Section need not examine the content of the priority document. However, where it is obvious, e.g. from the title of the document, that the document relates to subject-matter quite different from that of the application, the applicant should be informed that it appears that the document filed is not the relevant document.
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/a_iii_6_4.htm
Date retrieved: 17 May 2021