An elevator counterweight comprises a counterweight frame constructed from several vertical beams and at least three horizontal crossbars wherein the vertical beams penetrate the horizontal crossbars and form therewith several grid fields in which weight elements are arranged and fixed. In a first embodiment a heat generating element is employed as the linear element which when activated degrades the covering skin layer of the trim piece in pattern shape. After receiving a document for an e-commerce agreement that represents a legal agreement for a commercial transaction between the first business entity and the second business entity, the first business entity retrieves dependency information about the commercial transaction from the e-commerce agreement. The dynamically selected carrier corresponds to the band instantaneously occupied by the reference signal.