phantom:
"An item with an identifying product number that is not normally built and then stocked, but is immediately used in the next stage of production. MRP processing logic will blow through a phantom down to the next level (and not generate planned orders for the phantom) but will net against its on-hand inventory if it does occasionally exist. A phantom bill of material is sometimes used to ease maintenance when a set of parts consumed in production has identical usage across many bills of material. "
