EDocument UNECE Module
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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>`_