Limited planes not possible

[Wolkenbeisser]

I think I did this Caspar.

What I want is:

There are many planes in the list of that airfield (training map of our squadron). Now, for testing, I wanted, that there is only ONE P-51D-5NT for the players to pick. If it's picked by a player, the other pilots should be forced to take another plane (btw. Pilots should NOT be limited on this airfield). As soon as the P-51D-5NT is destroyed (or the player landed and hit 'refly') this single P-51D-5NT shoud be back in the pool of the planes.

The problem is, that it does not work, no matter how I tried. I know, it's my problem, because I already saw maps with this feature.

Let me show you some pictures of the settings I use. Maybe someone can tell me, where the error lies.