Schematic Help, removing ammo from inventory instead of junk.

[RalphMoors]

ive been my making my own custom weapon with ammo you have to produce at a workbench. you use 5 darts and 5 frag grenades and get 5 explosive darts. Problem is, it dousnt seem to bother checking my inventory for the materials, and gives me the ammo regardless, without removing anything, any help appreciated.