Stock Lot Unit Module
The stock_lot_unit module allows to define a unit and quantity on stock lot.
Lots with unit have the following properties:
no shipment may contain a summed quantity for a lot greater than the quantity of the lot.
no move related to a lot with a unit may concern a quantity greater than the quantity of the lot.
The Lot Unit field is added to the product. This defines the unit to set on new lot.