Member States could consider establishing fixed minimum and/or maximum tariff requirements with which the service providers must comply, especially for services where this is necessary for the effective application of the principle of reimbursing costs, as long as such restriction is proportionate and, where necessary, derogations from the minimum and/or maximum tariffs are provided for.
D’fhéadfadh na Ballstáit breithniú a dhéanamh ar cheanglais a bhunú maidir le híostaraifí agus/nó le huastaraifí socraithe a chaithfeadh na soláthraithe seirbhíse a chomhlíonadh, go háirithe i gcás seirbhísí ar gá sin a dhéanamh ina leith chun an prionsabal maidir le haisíoc costas a chur i bhfeidhm go héifeachtach, fad atá an srian sin comhréireach agus, i gcás inar gá, a dhéantar foráil do mhaoluithe ar na híostaraifí agus/nó ar na huastaraifí.