Errors in documents filed during opposition and limitation proceedings may be corrected under Rule 139 (G 1/12) as long as the corresponding proceedings are pending before the EPO.

In opposition and limitation, requests to correct an error under Rule 139 may not, however, be used to correct the content of the decision to grant, thereby circumventing the restrictions under Rule 140.

2.1.1.1 Errors in the description, claims and drawings