[EUGEN-T10-R012]-An allowance percentage MUST NOT be negative. [EUGEN-T10-R029]-An allowance charge reason code MUST have a list identifier attribute 'UNCL4465'. [EUGEN-T10-R027]-A country identification code MUST have a list identifier attribute 'ISO3166-1:Alpha2'. [EUGEN-T10-R040]-A customer SHOULD provide information about its legal entity information [EUGEN-T10-R034]-An delivery location identifier MUST have a scheme identifier attribute. [EUGEN-T10-R033]-A document type code MUST have a list identifier attribute 'UNCL1001'. [EUGEN-T10-R023]-An endpoint identifier MUST have a scheme identifier attribute. [EUGEN-T10-R031]-A financial account identifier MUST have a scheme identifier attribute. [EUGEN-T10-R044]-If the tax currency code is different from the document currency code, the tax exchange rate MUST be provided [EUGEN-T10-R025]-An invoice type code MUST have a list identifier attribute 'UNCL1001'. [EUGEN-T10-R024]-A party identifier MUST have a scheme identifier attribute. [EUGEN-T10-R004]-If the payment means are international account transfer and the account id is IBAN then the financial institution should be identified by using the BIC id. [EUGEN-T10-R028]-A payment means code MUST have a list identifier attribute 'UNCL4461'. [EUGEN-T10-R039]-A supplier SHOULD provide information about its legal entity information [EUGEN-T10-R041]-The VAT identifier for the supplier SHOULD be prefixed with country code for companies with VAT registration in EU countries [EUGEN-T10-R008]-For each tax subcategory the category ID and the applicable tax percentage MUST be provided. [EUGEN-T10-R032]-A tax category identifier MUST have a scheme identifier attribute 'UNCL5305'. [EUGEN-T10-R045]-Tax exchange rate MUST specify the calculation rate and the operator code. [EUGEN-T10-R043]-The total tax amount MUST equal the sum of tax amounts per category. [EUGEN-T10-R042]-The tax amount per category MUST be the taxable amount multiplied by the category percentage. [EUGEN-T10-R046]-If the tax currency code is different from the document currency code, each tax subtotal has to include the tax amount in both currencies