When the manufacturer's energy-based discrimination data are not available or the fault condition is causing operation of the protective device over  0.1 sec, ElectricalOM performs discrimination checks between the time-amperes curves of the protective devices, where overlapping curves indicate a discrimination problem. The check is made up to the value of the maximum prospective short-circuit current at the downstream protective device.

Recommendation to resolve the error:

Revise the protective device so the curves are not overlapping.