Updating
From TrueERP wiki
Overview
Some Products can be bought and sold in various units of measure. Example: You may purchase a product by the carton. Each carton may contain packs of six bottles. When selling the product you may offer the option of selling individual bottles, Packs of 6 bottles or entire Cartons. Using Units of Measure means that a user does not need to know the quantity of a carton or pack, they simply sell 1 carton etc.
