[CL-02]-The lists of valid languages are registered with the ISO 639 Maintenance Agency Codes for the Representation of Names of Languages. It is recommended to use the ISO 639-2 alpha-3 representation [CL-03]-currencyID MUST be coded using ISO code list 4217 alpha-3 [CL-04]-Value added tax point date code MUST be coded using a restriction of UNTDID 2005 [CL-05]-Object identifier identification scheme identifer MUST be coded using UNTDID 1153 [CL-06]-Note subject code MUST be coded using UNTDID 4451 [CL-07]-Business process type identifier SHOULD be one of the CEN TC 434 defined. [CL-08]-The scheme identifier MUST be one of the ISO 6523 ICD list. [CL-09]-Country codes in an invoice MUST be coded using ISO code list 3166-1 [CL-10]-Payment means in an invoice MUST be coded using UNTDID 4461 restricted code list [CL-11]-Invoice tax categories MUST be coded using UNCL 5305 code list [CL-13]-Item standard identifier scheme MUST be coded using UNCL 7143 code list [CL-14]-Coded allowance reasons SHOULD belong to the UNCL 4465 code list [CL-15]-Coded charge reasons SHOULD belong to the UNCL 7161 code list [CL-17]-Unit code MUST be coded according to the UN/ECE Recommendation 20 [CL-18]-For Mime code in attribute use MIMEMediaType.