if (!hasPlus && hasMinus) {
                WorkspaceEntry risingSignalWork = signalPhaseData.getRisingSignalWork(driverRef);
                if (risingSignalWork != null) {
                    result.add("there is " + signalRef + SignalTransition.Direction.MINUS
                            + " but no " + signalRef + SignalTransition.Direction.PLUS