Comment 7 for bug 734686

That's a very (very) specialised case, where ALL products you have are of the same weight, to not mess it up.

Here, we had such a special case, something bought as m³ (cubic metres, had to be called on the purchase order like this) and sold as kg.

I think the common way would have been to do a "unit conversion" by manufacturing, but that was too much overhead.

So we added a unit for m³ to weight. But even here, we wanted to avoid any misunderstandings, esp. with future products that may be added, and called it "m³ (48kg)", thus identifying it uniquely.