Hey guys, i couldnt see where to change this feature of the game

I mean when u do some soldier change/or move some to other army, u get 0 action points remaining, so u cant move, no fortification, no encamp etc

This is especially sux when u are a Hordic faction and it's winter, other times also annoying too, but as i said i couldnt find it's entry, so anybody got any idea?