The content of a European patent application or patent may be amended within the limits laid down in Art. 123(2) and (3). (For the conditions governing amendments, see also A-V, 2, C-VI, 5 and D-V, 6.) This will normally be done by submitting missing documents or by filing replacement pages. Where replacement pages are filed the applicant or patent proprietor should, in the interests of procedural efficiency, identify clearly all amendments made, and indicate on which passages of the original application these amendments are based.