I created a new ACEMPDocument under the WTDocument and the new product context created with no issues.
After looking at the Type Manager, I think they changed the naming and created sub-types under a different name.
I think I just copied the existing ACEMP Context template to NexGen. I should have exported the current active one to see what that would have looked like. I may do this and see if the ACEMPDocument is still referenced.