PCT Receiving Office Guidelines
Chapter VIII: Missing Parts or Erroneously Filed Elements or Parts in the International Application
Procedure in the Case of Correction of Defects under Rule 26 and Rectification of Obvious Mistakes under Rule 91
214. The procedure to be applied in case of correction of defects under Rule 26.4 and rectification of obvious mistakes under Rule 91 is set out in detail in Section 325.
215. Where renumbering of sheets is necessary due to deletion, substitution or addition of sheets of the international application, the procedure to apply is described in detail in Section 311.
216. A copy of any replaced sheet is kept in the home copy together with a copy of any letter accompanying the replacement sheet or containing a correction or rectification (Section 325(a)(iv)).