As a rule, a supplementary European search must be performed for each international application entering the European phase and a search fee must be paid. For an exception see point 567
ff. Like any European search report, the supplementary European search report is accompanied by an opinion under Rule 62 EPC
, the European search opinion (ESOP), on whether the application and the invention to which it relates meet the requirements of the EPC. The supplementary European search report together with the search opinion is known as the "extended (supplementary) European search report" (EESR).