Duplicate Item Recipe Help? (D2R)

[Wurmed]

I am trying to add a recipe to D2R's cubemain.txt that duplicates any item when you use a specific rune as input.

I'm currently testing a recipe with these fields set as follows:

description: 'Duplicate Small Charm'
enabled: 1
version: 100
numinputs: 2
input 1: scha
input 2: r1
output: useitem
output b: useitem


It should take a r1 (El rune) and a scha (Small Charm), and should output two of the same item (useitem) at output and output b.
However, this recipe just consumes the rune and leaves me with just 1 charm.

Has anyone had success with getting output b to generate an actual item in D2R? Or perhaps there is some other field I am missing.