EDocument UNECE Module
######################
The module adds many codes from the UNECE:
* `Recommendation N°. 20 Codes for Units of Measure Used in International
Trade <https://tfig.unece.org/contents/recommendation-20.htm>`_
* `5153 Duty or tax or fee type name code
<https://unece.org/fileadmin/DAM/trade/untdid/d16b/tred/tred5153.htm>`_
* `5305 Duty or tax or fee category code
<https://unece.org/fileadmin/DAM/trade/untdid/d16b/tred/tred5305.htm>`_