The module adds many codes from the UNECE:
Recommendation N°. 20 Codes for Units of Measure Used in International Trade 5153 Duty or tax or fee type name code 5305 Duty or tax or fee category code
Recommendation N°. 20 Codes for Units of Measure Used in International Trade
5153 Duty or tax or fee type name code
5305 Duty or tax or fee category code