Merkan SA carries out in September the annual scheduled maintenance of its production lines, for EUR 240,000 (case data). Case assumptions: the maintenance is performed and invoiced in the third quarter; before it is performed, Merkan SA has no obligation to carry it out, and the cost does not meet the definition of an asset at the annual closing. Management proposes to recognise EUR 60,000 per quarter "to smooth the quarters". What must Merkan SA do?