(1) Subject to Article 139, a European patent may be revoked with effect for a Contracting State only on the grounds that:
(c)168 the subject-matter of the European patent extends beyond the content of the application as filed or, if the patent was granted on a divisional application or on a new application filed under Article 61, beyond the content of the earlier application as filed;
(e) the proprietor of the European patent is not entitled under Article 60, paragraph 1.
(3) In proceedings before the competent court or authority relating to the validity of the European patent, the proprietor of the patent shall have the right to limit the patent by amending the claims. The patent as thus limited shall form the basis for the proceedings.