It doesn't need the root template name, it needs the stats file entry name. Sometimes they are the same and sometimes they aren't.
I took a quick look and the stats entry for "WPN_Wood_Shield_A_B" is just "WPN_Wood_Shield_A". So you need to use WPN_Wood_Shield_A
Also that WPN_Axe_A is a pretty high level axe if you didn't notice. It should scale anyway but I usually try and get them to match if I'm writing a custom entry. Unless of course it's a high level NPC in which case ignore me :P
