2.2 Content of the application as "originally" filed – general rules
2.2.4 Priority documents
It is not permissible to add to an international application matter present only in the priority document for that application, unless this is done under the provisions of Rule 20.6 (see GL/PCT‑EPO H‑II, 2.2.2). For correction of errors, see GL/PCT‑EPO H‑IV.