Some UOM values are derived from ratios
Some parameters can use a ratio to obtain the value for their units of measure. This example shows the density parameter. This parameter uses a KG/LT ratio UOM.
         - Description
 - Describes the ratio.
 - UOM Extend
 - Specifies the base unit of measure; this is the numerator.
 - Per UOM
 - Specifies the denominator.