* A catch weight item is an item that is sold by one unit of measure but is managed in inventory by a different unit of measure 1 . For example, diamonds are sold by boxes but weighed by carats. A full visibility catch weight item is a catch weight item that requires the weight of each individual container to be tracked 2 . For example, each box of diamonds must have its own weight recorded. * To set up a catch weight item for diamonds, you must do the following steps 2 : * Assign the item a Tracking dimension group with active serial number control . This enables the item to be tracked by serial numbers, which represent the individual containers of the item. Each serial number will have its own weight associated with it. * Assign the item a Serial number group with per qty. defined as 1 . This ensures that each container of the item has a unique serial number and that only one container can be assigned to a serial number. * Create an inter-class unit of measure conversion between boxes and carats . This defines the relationship between the sales unit and the inventory unit of the item. The conversion factor can be based on a nominal weight or an average weight of the containers.