This object indicates the number of R-APS PDUs discarded on the fsErpsRingPort2 of the ring due to version mismatch. The version discard count increments in the following scenarios:- a) If the (Request/State) field in the received R-APS PDUs does not correspond to R-APS(SF) or R-APS(NR) or R-APS event messages, when compatible version of the ring is 1. b) If the (Request/State) field in the received R-APS PDUs does not correspond to R-APS(SF) or R-APS(NR) or R-APS Event or R-APS(FS) or R-APS(MS) messages, when compatible version of the ring is 2.