I'm having real trouble trying to get simple database edits (with PFM) to work on this game.

I was planning on making a complete rebalance of all the units to give some greater variety to their roles and so started out tweaking a few values in land_units_tables, main_units_tables and melee_weapons_tables for a single unit and checking to see if it worked.

Unfortunately, none of the changes have taken effect in-game, either in custom battles or campaign.

Are there some additional steps that need to be taken with this game to get this kind of DB edit to take effect?