At room temperature the ternary stannide CeRuSn crystallizes with a super structure of the monoclinic CeCoAl-type structure. Charge ordering produces a doubling of the unit cell along the c axis, resulting in two non equivalent crystallographic sites for all three atoms. Crystallographic and magnetic studies suggest that one cerium site is filled with a trivalent cerium ion which orders antiferromagnetically below 2.6 K and the other one with an intermediate valent cerium ion which remains itinerant down to the lowest temperature [1,2,3]. Here we propose to measure the magnetic dynamical susceptibility of CeRuSn in order to to determine the energy scale of the crystal-field splittings of both cerium sites with an experiment on MERLIN or alternatively MARI. We akso want to separate the two Kondo scales kBTK by means of measuring the quasielastic line widths G/2 on LET, G/2 = kBTK on LET.