Tryton is a high-level general purpose application platform. It is the base of a complete business solution as well as a comprehensive health and hospital information system (GNUHealth).

This module adds many codes from the United Nations Economic Commission for Europe (UNECE):

* Recommendation N°. 20 Codes for Units of Measure Used in International Trade <https://www.unece.org/tradewelcome/ un-centre-for-trade-facilitation-and-e-business-uncefact/outputs/ cefactrecommendationsrec-index/ list-of-trade-facilitation-recommendations-n-16-to-20.html>

* 5153 Duty or tax or fee type name code <https://www.unece.org/trade/untdid/d16b/tred/tred5153.htm>

* 5305 Duty or tax or fee category code from <https://www.unece.org/trade/untdid/d16b/tred/tred5305.htm>