@Auda
1. RwF adds 2 new categories of Slots, but it is actually very easy to add support for that in BRS. As I understand, you managed to do that.
2. The main issue, that causes malfunction of parts of reports is that Rule with Faith uses a modifier that is not properly defined (well, it's actually not defined at all). It's probably a typo.
Code:
JFD_ABSOLUTE_MONARCHY_GREAT_PEOPLE_DISCOUNT_FAITH MODIFIER_PLAYER_ADJUST_GREAT_PERSON_PATRONAGE_DISCOUNT_PERCENT
JFD_ABSOLUTE_MONARCHY_GREAT_PEOPLE_DISCOUNT_GOLD MODIFIER_PLAYER_ADJUST_GREAT_PEOPLE_PATRONAGE_DISCOUNT_PERCENT
There is no MODIFIER_PLAYER_ADJUST_GREAT_PEOPLE_PATRONAGE_DISCOUNT_PERCENT. The correct one is MODIFIER_PLAYER_ADJUST_GREAT_PERSON_PATRONAGE_DISCOUNT_PERCENT.
So, as you can see I would rather say that RwF is not compatible with BRS, not the other way around...
And last, but not least - there were errors in Lua.log about nil string that came from modifier analysis. That is how I could quickly locate the erronous policy.