It is due to a problem at MMR end for Marathwada. No RSA could be arranged at the MMR end for the train to receive maintenance at some station in CR. So SCR does the maintenance and has no option but to shunt the rake to NED everyday from Dharmabad.
And due to the train's timings, it will not be possible to give it primary maintenance unless some RSA is established. Hence the RSA with Tapovan.