(1) Apportionment of costs shall be dealt with in the decision on the opposition. Such apportionment shall only take into consideration the expenses necessary to assure proper protection of the rights involved. The costs shall include the remuneration of the representatives of the parties.
(2) A bill of costs, with supporting evidence, shall be attached to the request for the fixing of costs. The request shall only be admissible if the decision in respect of which the fixing of costs is required has become final. Costs may be fixed once their credibility is established.
(3) The request for a decision by the Opposition Division on the awarding of costs by the registry, stating the reasons on which it is based, must be filed in writing to the European Patent Office within one month after the date of notification of the awarding of costs. It shall not be deemed to be filed until the fee for the awarding of costs has been paid.
(4) The Opposition Division shall take a decision on the request referred to in paragraph 3 without oral proceedings.