Description
The unit of measure that applies to the invoiced quantity.
The unit of measure shall be chosen from the lists in UN/ECE Rec.20 "Codes for Units of Measure Used in International Trade" and UN/ECE Rec. 21 "Codes for Passengers, Types of Cargo, Packages and Packaging Materials (with Complementary Codes for Package Names)" applying the method described in UN/ECE Rec. 20 Intro 2.a). Note that in most cases it is not needed for Buyers and Sellers to implement these lists fully in their software. Sellers need only to support the units needed for their goods and services; Buyers only need to verify that the units used in the Invoice are equal to the units used in other documents (such as Contract, Catalogue, Order and Despatch advice).