6. Indication of amendments and their basis  

The applicant is obliged to indicate the basis in the application as originally filed for any amendments filed., i.e. the applicants may indicate in an accompanying letter

–the differences between the application as originally filed and any amendments made,

–the basis for the amendments in the application as filed, and

–the reasons for any such amendments.

If the basis for any amendment is not indicated as required and is not apparent, the EPO will establish the written opinion and/or IPER as if no amendments had been filed and without first issuing a reminder. If no such basis is indicated, the IPER may be established as if the amendments had not been made. If an IPER is issued, this This is indicated in the IPER under Section I.

If a further WO-IPEA (Form 408) is sent (with respect for the principles set out in GL/PCT‑EPO C‑IV, 2.2), there should be a similar indication in the WO-IPEA as to which amendments could not be taken into account. Further, the applicant may also be reminded in this WO-IPEA to specify the basis for the amendments which may be filed in reply to the WO-IPEA. However, a WO-IPEA whose only content would be a request to indicate the basis for such amendments will not be sent; instead, the IPER is established directly.