(k) The details as well as the data that the Supplier is obliged to communicate to RAE in order to fulfill its obligations in accordance with paragraph 4 of article 49. (l) RAE&#39;s obligations regarding better informing consumers and facilitating their choice of Supplier. (c) The basic principles of drawing up supply invoices so that, among other things, they are easily comparable, taking into account the measurement practices followed by the managers of the Energy Distribution Systems and Networks.