ammo crate proxy on vehicle

[5133p39 16]

I know there are many threads about proxies, i have read them ALL.

But i still don't know how to do it:

i want to place Ammo crate on my vehicle.

In O2 i have added proxy:bedna_ammo_in.01 into each resolution LOD, and created a selection for it called "ammo"

In the config.cpp of the addon i put the cfgModels section where i set the sections[]=["ammo"];

Then in the cfgVehicle class i put hiddenSelections={};

...but i dont see the crate in game. What am i doing wrong?