I have exported an edited file from FM18 with all the database changes cleared beforehand, so I could only import to FM19 editor the structure of a nation created with the advanced rules.
Then, I have corrected all the database errors between the FM19 database and the custom nation structure (like number of required teams to competition).
When I test rules, I get a series of errors. Some of them I figured out because you have excluded/changed some editor features (i.e. "Champion Withou