conversion factor on condition recorder

Hi All,

I have surcharge on billing document, this surcharge is fixed value by box, the UOM on billing is PC(Pieces).

I configure a condition type for surcharge, and maintain the condition recorder by box, maintain the conversion factor, but the conversion factor does not work in billing, the surcharge is caculated by PC, not by Box.

For example, I create the condition recorder

Material Amount Unit per UOM

M-001 1.00 USD 1 BOX

Conversion factor:

1 Box <=> 2 PC

I have 3 pc in billing document.

But the surcharge is 1.5 USD, not 2 USD.

Why does the conversion factors not work?

How can I get the surcharge by box?