The unit of the quantity. Codes for unit of packaging from UNECE Recommendation No. 21 can be used in accordance with the descriptions in the "Intro" section of UN/ECE Recommendation 20, Revision 11 (2015): The 2 character alphanumeric code values in UNECE Recommendation 21 shall be used. To avoid duplication with existing code values in UNECE Recommendation No. 20, each code value from UNECE Recommendation 21 shall be prefixed with an “X”, resulting in a 3 alphanumeric code when used as a unit of measure.

Usage
Mandatory
Example value
EA
Code lists
UN/ECE Recommandation 20, including Rec. 21 codes (prefixed with X)
Rules
Identifier/Error message Flag
EHF-PAC-B11502
Value MUST be part of code list 'UN/ECE Recommandation 20, including Rec. 21 codes (prefixed with X)'.
fatal