EN 16931
European core rules (business rules & code lists) of the EN 16931 standard. 1562 rules.
UBL content rules (UBL-CR) 678Binding of the EN 16931 rules to the UBL syntax.CII syntax rules (CII-SR) 482Binding of the EN 16931 rules to the CII syntax (ZUGFeRD/Factur-X).CII data-type rules (CII-DT) 101Data-type and attribute rules of the CII syntax.VAT category rules 98Rules per VAT category (standard, zero, exempt, reverse charge …).Business rules (BR) 58The numbered core business rules of EN 16931 (BR-1 to BR-65).UBL structure rules (UBL-SR) 54Structural requirements of the UBL syntax.UBL data-type rules (UBL-DT) 24Data-type and attribute rules of the UBL syntax.Code-list rules (BR-CL) 23Allowed values from code lists (currency, country, VAT category …).Calculation rules (BR-CO) 23Consistency of totals, amounts and the VAT breakdown.Decimal rules (BR-DEC) 21Permitted decimal places of the amount fields.