No, there is not. There literally can't be, because if a "code" would be underhanded criticism, it would be illegal. Simple as that.
So you end up with a bunch of people trying to interpret the codes from both sides, but if they use the same interpretation is impossible to tell.
The code is not written anywhere so good luck suing your employer for "wishing you all the best in your future endeavors".
Example one: https://www.betriebsrat.de/news/achtung-arbeitszeugnis-20424?gad_source=1&gclid=EAIaIQobChMIoPvXq8HjiAMVbJRQBh0XOS9bEAAYAiAAEgKk1PD_BwE
there was/is a code and the law also adapted to that lol
People tweeting stuff. We allow tweets from anyone.
RULES:
No, there is not. There literally can't be, because if a "code" would be underhanded criticism, it would be illegal. Simple as that.
So you end up with a bunch of people trying to interpret the codes from both sides, but if they use the same interpretation is impossible to tell.
The code is not written anywhere so good luck suing your employer for "wishing you all the best in your future endeavors".
Example one: https://www.betriebsrat.de/news/achtung-arbeitszeugnis-20424?gad_source=1&gclid=EAIaIQobChMIoPvXq8HjiAMVbJRQBh0XOS9bEAAYAiAAEgKk1PD_BwE
there was/is a code and the law also adapted to that lol