Adding a Template Graft
 

I'm trying to build a "standard" Bone Trooper.

As per Alien Archive 2, I should take an Undead Combatant-Dexterity NPC and add the Bone Trooper Template Graft (p.23).

I create an NPC, give it the race of Elebrian.
The Creature Type Graft is set automatically to "Humanoid".
I need to take this NPC and make it an undead. In Creature Type Graft, I add Undead, but then I get an error that I have too many Creature Type Graft.

I can I make an Undead Elebrian Bone Trooper?

Can you help/assist?

Thanks.