This read-only object reports the specific error code, drawn from the same set used elsewhere in this MIB, that the Radio Master most recently transmitted to a Radio Slave in an Authorization Invalid message, defaulting to noInformation(0) at bootup. It tells the admin, from the master's side, exactly why it rejected that slave's authorization request. For example, if cwrBpiRmAuthInvalidErrorCode shows unauthorizedSlave, the admin would know the master is deliberately refusing to authorize that particular radio rather than encountering a protocol error.