Appreciate your work messi!
I wonder if you add lower leagues to the original advanced rules or just add them to basic rules?
Because adding lower leagues to basic rules may cause advanced features missing, for example, National League South will keep 21 teams all the time, besides, promotion / relegation teams below lev.7 get into wrong regions.
Sorry I just read the whole post, now I have a new question: How did you solve with the error when it comes to verifying the advanced rules? Even the vanilla rules show error like:
Sorry for my poor English, hope you can understand