It seems to me that the court in question is the Arbeitsgericht Berlin. I couldn't find the referenced code[1], and I then went through the list of documents of Nov 2020 in chronological order, and couldn't find it either. I don't know where to take this next--write to or call the court to ask for details?

[1] https://www.berlin.de/gerichte/arbeitsgericht/suche.php?q=42...