Providers of online intermediation services should bear a reasonable proportion of the total costs of the mediation, taking into account all relevant elements of the case at hand. To that end, the mediator should suggest which proportion is reasonable in the individual case. In light of the costs and of the administrative burden associated with the necessity to identify mediators in terms and conditions, it is appropriate to exempt from that obligation any providers of online intermediation services which are small enterprises, in line with the relevant provisions of Recommendation 2003/361/EC. The consolidation rules laid down in that Recommendation ensure that any circumvention of that obligation is prevented. Nevertheless, this should not affect the right of such enterprises to identify mediators in their terms and conditions that comply with the criteria set out in this Regulation.