public static boolean checkExitEventPresetPostset(Wtg wtg) {
        for (Waveform waveform : wtg.getWaveforms()) {
            for (ExitEvent exit : wtg.getExits(waveform)) {
                String msg = "Waveform '" + wtg.getName(waveform) + "' has an exit event ";
                if (!wtg.getPostset(exit).isEmpty()) {