What's a UOM interclass conversion?

A UOM interclass conversion defines the conversion between the source base UOM in one UOM class, and the destination base UOM, in a different UOM class.

For example, suppose the item is gasoline. The From Base UOM (of the From Class called volume) is liters. The To Base UOM (of the To Class called quantity) is Barrels. The conversion is 158.76 liters (volume) to 1 barrel of oil (quantity).

You cannot create the interclass and intraclass conversions when building the standard conversions. The UOM must be defined prior to creating Items. Items must be defined prior to creating interclass or intraclass conversions.