unit of measure (UOM)
 A UOM is a standard used to measure and convert quantities of items.
		UOMs are the lowest level building block of the Optiva
		application. The UOMs are usually assigned to parameters. Items then have parameter values
		assigned to them, usually using a UOM. These values are then rolled into formulas as items
		are added directly (to formulas) or indirectly (through sub-formulas).