unit of measure
 Defined by Optiva. UOM is a standard
		that is used to measure and convert quantities of items. UOMs are the lowest level building
		block of the Optiva application. 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).