Customer Item Data: UOM and Conv. factor

[HDeriauFF]

How does the customer item data work (if it works ;-))

For suppliers, everything works as expected, we got our UOM factors behave the way we want, we can order by the case and it translates in each when we receive.

But for customers, I don't understand. I set up a UOM being the case and the conversion factor being 12 for an item, but nowhere on my orders/packing slips I see that entering 48 each of this item converts to my customer to 4 cases. What am I doing wrong?

Thank you!