PEPPOL-EN16931-CL007: Currency code must be according to ISO 4217:2005

The rule requires that the currencyID attribute on any of the listed monetary amount elements (cbc:Amount, cbc:BaseAmount, cbc:PriceAmount, cbc:TaxAmount, cbc:TaxableAmount, cbc:LineExtensionAmount, cbc:TaxExclusiveAmount, cbc:TaxInclusiveAmount, cbc:AllowanceTotalAmount, cbc:ChargeTotalAmount, cbc:PrepaidAmount, cbc:PayableRoundingAmount, cbc:PayableAmount) contains a value that appears in the ISO 4217 currency code list defined by the rule. The test checks that the attribute equals one of the codes in $ISO4217; if it is not in that list, the document is rejected as fatal.

Set the currencyID attribute on the affected amount element(s) to a valid ISO 4217 currency code from the rule's list, such as EUR or USD. If the invoice is generated from a system, ensure the currency code field is mapped to a code from that list and not left empty or set to an unsupported value.