I've got the great PFM up and running and was trying to add the Immune to Attrition trait to a few units.

First problem, only units that have "Immune to Attrition" set to True in PFM are all Naginata class units. Clearly not the ones that are immune to attrition in-game. Setting this to True on new units gives me the "Encourages Nearby Units" trait description, but they do not actually have that effect on the battlefield. This is strange since all those Naginata class units do not have this description.

The units that are attrition immune in-game, Generals and Heroes, don't really seem to have any True-set Booleans in common. Resistant to Morale Shocks is out, and I've tried Heat Resistant and that didn't work.

Have I screwed up my PFM somehow, or is the Immune to Attrition trait not something we can modify (yet)?