How to make Drop Table check for player permission?

I'd like players to get different loot from mobs, if they have different permissions.

I tried using this in the drop table config:
Conditions:
- haspermission{p=loot.perm} true

...but it didn't work, so I tried to find a solution and made a skill for the mob with the "haspermission" condition, which would then set a stance for the mob depending on the permissions of the attacking player, and give drops depending on what stance the mob is set at... sadly it also didn't work.

Now I'm...

How to make Drop Table check for player permission?