When filing amendments, the applicant must identify them and indicate the basis for them in the application as filed. The requirement that the basis for amendments be indicated is met if, on consulting those parts of the application indicated, it is not necessary to look further in order to assess the amendment's compliance with Art. 123(2). Non-specific indications such as "see the description as filed" or "see the claims as filed" or "see the examples as filed" are generally not considered sufficient. This requirement also applies in cases where the applicant requests the Examining Division to amend his application (see H-III, 2.4).
Whether the requirements of Rule 137(4) are met is assessed independently of whether the amendments in question comply with Art. 123(2). For example, the applicant may indicate that a particular amendment is based on a technical feature disclosed only in a schematic drawing. If the feature supposedly forming the basis for the amendment is indeed disclosed in the drawing indicated by the applicant, the requirements of Rule 137(4) are met, irrespective of whether the amendment based on that technical feature is allowable according to Art. 123(2) (see H-IV, 2.5).
Where the application was not filed in an official language of the EPO, in the absence of evidence to the contrary, for the purpose of assessing compliance with Art. 123(2) the EPO assumes that any translation of the application as filed is accurate. Consequently, in order to comply with Rule 137(4) it is sufficient to indicate the basis of an amendment in the translation of the application as filed.