I add the msh of a lance from the BF1 asset to a melee weapon and the soldiers only move the hands without the weapon

here is my odf:

Is the weapon msh even in your side's MSH folder?

yes of course

EDIT: that is the option msh data:

-nocollision -nogamemodel



maybe i've just to remove the last one

That would make sense. Try it out. I just had a look at the GAM side from the BF1 assets and there is no msh called "gam_weap_inf_weequayaxe" but there is a "gam_1st_weap_inf_weequayaxe." Did you rename it?

yes i did

Okay... so did removing the -nogamemodel line from the msh.option file solve the problem or what?

no

I've tested it a few secounds ago.
No change