This is a Perfect Team feature.
It looks like there is a rather lengthy discussion about these in the PT sub-folder here:
https://forums.ootpdevelopments.com/...d.php?t=308628
The actual announcement there didn't have much detail so I won't bother linking that here but you can find that in the PT sub-folder also.
I don't play PT so I can't really speak to this but you should be able to get plenty more information along the way in that sub-folder.