Validation rule reference

• BR-01Add the specification identifier in CustomizationID

  The document root needs a non-empty cbc:CustomizationID. For Peppol BIS Billing 3.0 it is a fixed value, not something read from source data.

• BR-02Add the invoice number in the document-level cbc:ID

  The cbc:ID directly under the document root must contain the invoice or credit note number. An empty element fails; a missing one is stopped by the XSD.

• BR-04Add the invoice type code

  The document has no cbc:InvoiceTypeCode (cbc:CreditNoteTypeCode in a credit note), or it is blank. Add the code for what the document is, such as 380.

• BR-05Add the invoice currency code

  The document has no cbc:DocumentCurrencyCode, or it is blank. State the currency the invoice is issued in as a three-letter ISO 4217 code.

• BR-06Add the seller name as the supplier RegistrationName

  The supplier party needs a non-empty cbc:RegistrationName inside cac:PartyLegalEntity. A trading name in cac:PartyName does not count.

• BR-07Add the buyer name as the customer RegistrationName

  The customer party needs a non-empty cbc:RegistrationName inside cac:PartyLegalEntity. An empty element fails, and so does leaving it out.

• BR-08Add the seller postal address

  The seller cac:Party must contain a cac:PostalAddress. This rule checks only that the group is there; the country code inside it is checked by BR-09.

• BR-10Add the buyer postal address

  The buyer cac:Party needs a cac:PostalAddress child. Only its presence is tested here; the buyer country code inside it is the subject of BR-11.

• BR-11Add the country code to the buyer postal address

  A buyer cac:PostalAddress must contain cac:Country/cbc:IdentificationCode with a value. A missing, empty or blank code fails alike.

• BR-12Add the sum of line net amounts to the monetary totals

  cac:LegalMonetaryTotal has no cbc:LineExtensionAmount. Write the sum of the line net amounts there, even when the document has a single line.

• BR-13Add the total without VAT to the monetary totals

  cac:LegalMonetaryTotal has no cbc:TaxExclusiveAmount. Add the total without VAT: the line total minus document allowances plus document charges.

• BR-17Name the payee, or remove a payee that is the seller

  A cac:PayeeParty needs cac:PartyName/cbc:Name, and its name or identifier must not repeat the seller's. If the seller is paid, leave the payee out.

• BR-18Add the name of the seller tax representative

  A cac:TaxRepresentativeParty must carry a name in cac:PartyName/cbc:Name. A blank name fails, and a cbc:RegistrationName does not count.

• BR-21Give every line a non-empty line identifier

  The cbc:ID at the start of each invoice or credit note line must hold some text. An empty or blank line identifier fails; its value is not checked.

• BR-22Add the invoiced or credited quantity to every line

  Each line needs a quantity element, cbc:InvoicedQuantity or cbc:CreditedQuantity. Without it the unit code check and the line calculation fail too.

• BR-23Add the unitCode attribute to the line quantity

  The cbc:InvoicedQuantity or cbc:CreditedQuantity on each line must carry a unitCode attribute naming its unit of measure.

• BR-25Give every line an item name

  Each invoice or credit note line needs a non-empty cac:Item/cbc:Name. It is checked per line, and an item description does not stand in for it.

• BR-26Add the item net price to every line

  Each line needs cac:Price/cbc:PriceAmount, the net price per unit. A line with no cac:Price fails here, and the Peppol line calculation fails with it.

• BR-27Fix a negative item net price by moving the sign to the quantity

  The item net price on a line is below zero. Prices must be zero or positive: express a credit or correction with a negative quantity.

• BR-28Make the item gross price zero or positive

  The gross price in cbc:BaseAmount of a line price discount must not be below zero. A credit or correction takes its sign from the quantity.

• BR-29Fix an invoicing period that ends before it starts

  When the document-level invoicing period gives both dates, cbc:EndDate must fall on the same day as cbc:StartDate or later.

• BR-32Add a VAT category to each document-level allowance

  A document-level allowance needs a cac:TaxCategory with a cbc:ID under the VAT scheme, so the discount is taken off the right VAT breakdown.

• BR-45Add the taxable amount to each VAT breakdown

  Every cac:TaxSubtotal needs a cbc:TaxableAmount: the net amount on which the VAT in that breakdown is calculated.

• BR-47Add the VAT category code to each VAT breakdown

  Every cac:TaxSubtotal needs a cac:TaxCategory/cbc:ID holding the VAT category code, in a tax category whose tax scheme is VAT.

• BR-48Add the VAT rate to each VAT breakdown

  Every VAT breakdown needs cbc:Percent in its tax category, even when the rate is 0. Only category O, not subject to VAT, may leave it out.

• BR-50Add the account identifier to the payee financial account

  A credit transfer with code 30 or 58 has a cac:PayeeFinancialAccount but no account number in its cbc:ID. Add the real account identifier.

• BR-51Replace the full card number with its last four digits

  Warning: cbc:PrimaryAccountNumberID is longer than 10 characters, which points to a full card number. Send the last four digits; the invoice stays valid.

• BR-52Add an identifier to each supporting document reference

  Every cac:AdditionalDocumentReference needs a cbc:ID naming the supporting document. An identifier that is empty or only whitespace fails.

• BR-53Add the VAT total in the VAT accounting currency

  When cbc:TaxCurrencyCode is given, the document needs a second tax total whose cbc:TaxAmount is stated in that currency.

• BR-54Give every item attribute both a name and a value

  Each cac:AdditionalItemProperty must have a cbc:Name and a cbc:Value. If the item has no value for an attribute, leave the attribute out.

• BR-55Add the preceding invoice number to the billing reference

  Each cac:BillingReference must hold cac:InvoiceDocumentReference with a cbc:ID. Leave the billing reference out if there is no preceding invoice.

• BR-56Add the VAT identifier of the seller tax representative

  A cac:TaxRepresentativeParty needs a cac:PartyTaxScheme with tax scheme VAT and a cbc:CompanyID: the VAT number of the representative itself.

• BR-57Add the country code to the deliver-to address

  A deliver-to address in cac:DeliveryLocation/cac:Address must include cac:Country/cbc:IdentificationCode. Only its presence is tested here.

• BR-61Add the payee account to a credit transfer

  Payment means code 30 or 58 announces a credit transfer, so the invoice must say which account to pay: cac:PayeeFinancialAccount/cbc:ID.

• BR-62Add the schemeID attribute to the seller electronic address

  When the seller Party has a cbc:EndpointID, the element must carry a schemeID attribute saying which scheme the address belongs to.

• BR-63Add the schemeID attribute to the buyer electronic address

  A buyer cbc:EndpointID must carry a schemeID attribute. The rule tests that the attribute exists, not what it contains.

• BR-64Add the schemeID attribute to the item standard identifier

  An item standard identifier in cac:StandardItemIdentification/cbc:ID must say which scheme it belongs to, in schemeID: 0160 for a GTIN.

• BR-65Add the listID attribute to the item classification code

  An item classification code in cac:CommodityClassification must name its classification system in listID, using a UNTDID 7143 code.

• BR-CO-03Send either the VAT point date or the VAT point date code, not both

  cbc:TaxPointDate and the VAT point date code in cac:InvoicePeriod/cbc:DescriptionCode must not appear together. Send one of them, or neither.

• BR-CO-04Add the VAT category code to every invoice line

  Each line needs cac:Item/cac:ClassifiedTaxCategory/cbc:ID under the VAT tax scheme, giving the VAT category of the item.

• BR-CO-09Add the country prefix to a VAT identifier

  Seller, buyer and tax representative VAT identifiers must begin with a two-letter country code in upper case, such as GB or EL.

• BR-CO-10Fix a line total that does not match the sum of the lines

  The sum of line net amounts in the monetary totals must equal the line net amounts added together, rounded to two decimals.

• BR-CO-11Fix a document allowance total that does not match its allowances

  The allowance total in the monetary totals must equal the sum of the document-level allowance amounts, rounded to two decimals.

• BR-CO-12Fix a document charge total that does not match its charges

  The charge total in the monetary totals must equal the sum of the document-level charge amounts, rounded to two decimals.

• BR-CO-13Fix a total without VAT that does not follow from the other totals

  The total without VAT must equal the line total minus the document allowance total plus the document charge total, to two decimals.

• BR-CO-14Fix a VAT total that does not match the VAT breakdown

  The VAT total of a tax total must equal the sum of the tax amounts in its VAT breakdowns, rounded to two decimals.

• BR-CO-15Fix a total with VAT that is not the total without VAT plus the VAT total

  The total with VAT must equal the total without VAT plus the VAT total in the document currency, rounded to two decimals.

• BR-CO-16Fix an amount due that does not follow from the total with VAT

  The amount due must equal the total with VAT minus the prepaid amount plus the rounding amount, to two decimals.

• BR-CO-17Fix a VAT breakdown amount that does not match taxable amount times rate

  Each VAT breakdown tax amount must agree with its taxable amount times its rate. The check tolerates a difference below 1.00; the correct figure does not.

• BR-CO-18Add the missing VAT breakdown to the tax total

  Every invoice and credit note needs at least one VAT breakdown: a TaxSubtotal inside a document-level TaxTotal.

• BR-CO-19Give the invoicing period a start date, an end date or both

  An invoicing period in cac:InvoicePeriod needs cbc:StartDate, cbc:EndDate or both. A description of the period in words does not count.

• BR-CO-21Give each document-level allowance a reason code or reason text

  A discount or other allowance on the whole document must say why it is given, in cbc:AllowanceChargeReasonCode, cbc:AllowanceChargeReason or both.

• BR-CO-22State the reason for each document-level charge

  A charge on the whole document, such as freight or packing, must carry a reason code from UNTDID 7161, a reason text, or both.

• BR-CO-23Add a reason to each allowance on an invoice line

  An allowance attached to an invoice or credit note line must name its reason with a code, text or both. The price discount inside cac:Price is not covered.

• BR-CO-26Give the seller a VAT, legal registration or seller identifier

  The seller must carry at least one of a VAT identifier, a seller identifier in cac:PartyIdentification, or a legal registration identifier.

• BR-CL-01Use a permitted document type code

  cbc:InvoiceTypeCode and cbc:CreditNoteTypeCode must hold a UNTDID 1001 code from the list for that document, such as 380 or 381.EN 16931

• BR-CL-03Use an ISO 4217 currency code in every currencyID attribute

  The currencyID of an amount is not a three-letter ISO 4217 code. Use the code of the invoice currency, such as GBP, in upper case.EN 16931

• BR-CL-04Use an ISO 4217 alphabetic code for the invoice currency

  cbc:DocumentCurrencyCode must be a current three-letter ISO 4217 code in upper case, such as GBP. Names, symbols, numeric codes and lower case fail.EN 16931

• BR-CL-10Use an ISO 6523 ICD code as the scheme of a party identifier

  The schemeID on a cac:PartyIdentification/cbc:ID must be an ISO 6523 ICD code, such as 0088 for a GLN. SEPA is allowed for seller and payee only.EN 16931

• BR-CL-13Use a UNTDID 7143 code in the classification listID

  The listID on an item classification code must be a UNTDID 7143 code, such as TST for UNSPSC or STI for CPV, not the name of the scheme.EN 16931

• BR-CL-14Use an ISO 3166-1 alpha-2 country code in addresses

  Every cac:Country/cbc:IdentificationCode must be a two-letter ISO 3166-1 code in upper case. The code for the United Kingdom is GB, not UK.EN 16931

• BR-CL-16Use a UNTDID 4461 payment means code

  cbc:PaymentMeansCode must be a UNTDID 4461 code, such as 30 for credit transfer or 49 for direct debit, not a bank scheme or product name.EN 16931

• BR-CL-17Use a permitted VAT category code in each tax category

  Every cac:TaxCategory/cbc:ID must be one of S, Z, E, AE, K, G, O, L, M or B. Internal tax codes such as SR are rejected.EN 16931

• BR-CL-18Use a permitted VAT category code on each line item

  The line category in cac:ClassifiedTaxCategory/cbc:ID must be a permitted code such as S, Z or E. An internal code like SR is rejected.EN 16931

• BR-CL-19Use an allowance reason code from the UNTDID 5189 list

  An allowance reason code must be one of the UNTDID 5189 codes permitted in Peppol, such as 95 for Discount. A word such as DISCOUNT is not a code.EN 16931

• BR-CL-20Use a charge reason code from the UNTDID 7161 list

  A charge reason code must be an upper-case UNTDID 7161 code, such as FC for freight or DL for delivery. Plain words such as FREIGHT are rejected.EN 16931

• BR-CL-21Use an ISO 6523 ICD code in the item identifier schemeID

  The schemeID on an item standard identifier must be a code from the ISO 6523 ICD list. For a GTIN that is 0160, not the text GTIN.EN 16931

• BR-CL-22Use a VATEX code for the VAT exemption reason code

  cbc:TaxExemptionReasonCode must hold a code from the VATEX list, such as VATEX-EU-132. Made-up codes are rejected; send reason text if no code fits.EN 16931

• BR-CL-23Use a UN/ECE Recommendation 20 code in unitCode

  Every unitCode on a line quantity or price base quantity must be a UN/ECE Rec 20 or Rec 21 code, in upper case. Local abbreviations such as EACH fail.EN 16931

• BR-CL-24Use a permitted MIME code for embedded attachments

  The mimeCode of an embedded attachment must be one of six values: PDF, PNG, JPEG, CSV, Excel xlsx or OpenDocument spreadsheet. Anything else fails.EN 16931

• BR-CL-25Use an EAS code as the schemeID of an electronic address

  The schemeID on every cbc:EndpointID must be a code from the Electronic Address Scheme (EAS) list, such as 0088, matched exactly.EN 16931

• PEPPOL-EN16931-CL008Use a Peppol electronic address scheme code in EndpointID

  The schemeID on each cbc:EndpointID must exactly match a code on the Peppol list of electronic address schemes, such as 0088 for a GLN.Peppol BIS Billing

• BR-DEC-01Write the document allowance amount with no more than two decimals

  A document-level allowance amount has more than two digits after the decimal point. Write it with two at most: 1.00 passes, 1.000 fails.

• BR-DEC-12Write the total without VAT with no more than two decimals

  cbc:TaxExclusiveAmount in the monetary totals has more than two digits after the decimal point. Write the total without VAT to two decimals at most.

• BR-DEC-18Write the amount due with no more than two decimals

  cbc:PayableAmount has more than two digits after the decimal point. Round the amount due for payment to two decimals and format it that way.

• BR-DEC-20Write each VAT breakdown tax amount with no more than two decimals

  The cbc:TaxAmount of a cac:TaxSubtotal has more than two digits after the decimal point. Round the VAT category tax amount to two decimals.

• BR-DEC-23Write the line net amount with no more than two decimals

  A line net amount has more than two digits after the decimal point. Round it to two decimals; trailing zeros count, so 25.000 fails.

• BR-DEC-24Write the line allowance amount with no more than two decimals

  An allowance on an invoice line has a cbc:Amount with more than two digits after the decimal point. Round the line allowance to two decimals.

Standard rated (S) (6)

• BR-S-01Add the Standard rated VAT breakdown that the lines, allowances or charges require

  If any line, document allowance or document charge is Standard rated, the VAT breakdown needs a Standard rated entry too, and the reverse also holds.

• BR-S-02Add the seller VAT identifier when lines are Standard rated

  A document with a Standard rated line must identify the seller for VAT, through the seller's own tax identifier or a tax representative's VAT identifier.

• BR-S-05Give a Standard rated line a VAT rate above zero

  A line in VAT category S needs a rate greater than zero in its item tax category. A rate of 0, a negative rate or no rate at all fails.

• BR-S-08Fix a Standard rated taxable amount that does not match its lines, charges and allowances

  For each Standard rate, the breakdown taxable amount must match the Standard rated line amounts plus document charges minus document allowances at that rate.

• BR-S-09Fix the VAT amount of a Standard rated breakdown

  In a Standard rated VAT breakdown the tax amount must agree with taxable amount times rate. Differences below 1.00 get through the check but are still wrong.

• BR-S-10Remove the exemption reason from a Standard rated VAT breakdown

  A Standard rated VAT breakdown must not carry exemption reason text or an exemption reason code. VAT is charged in category S, so nothing is exempt.

Zero rated (Z) (3)

• BR-Z-01Add exactly one Zero rated VAT breakdown when the document has Zero rated content

  A document with a Zero rated line, document allowance or document charge needs exactly one Zero rated VAT breakdown: not none, and not two.

• BR-Z-05Set the VAT rate of a Zero rated line to 0

  A line in VAT category Z must have a VAT rate of exactly 0. Any other rate on the line, or no rate element at all, fails.

• BR-Z-10Remove the exemption reason from a Zero rated VAT breakdown

  A Zero rated VAT breakdown must carry neither exemption reason text nor an exemption reason code. The category Z says all that is needed.

Exempt (E) (4)

• BR-E-01Use exactly one exempt VAT breakdown for all exempt content

  When a line, document allowance or document charge is exempt, the VAT breakdown needs exactly one entry in category E: not none, and not one per reason.

• BR-E-08Make the exempt taxable amount equal the exempt lines, charges and allowances

  The exempt VAT breakdown taxable amount must equal exempt line net amounts plus exempt document charges minus exempt document allowances, exactly.

• BR-E-09Set the tax amount of the exempt VAT breakdown to zero

  No VAT is charged in the exempt category, so the tax amount of a VAT breakdown with category E must be exactly 0.

• BR-E-10Add the exemption reason to an exempt VAT breakdown

  A VAT breakdown in the exempt category must say what the exemption is, through exemption reason text, an exemption reason code, or both.

Reverse charge (AE) (4)

• BR-AE-02Identify the seller and the buyer on a reverse-charge invoice

  A document with a reverse-charge line needs a seller tax identifier and, for the buyer, a VAT identifier or a legal registration identifier.

• BR-AE-05Set the VAT rate of a reverse-charge line to 0

  A line in VAT category AE must have a VAT rate of exactly 0, even though the buyer will account for VAT on the supply.

• BR-AE-09Set the tax amount of the reverse-charge VAT breakdown to zero

  The seller charges no VAT under reverse charge, so a VAT breakdown with category AE must show a tax amount of exactly 0.

• BR-AE-10Add the reverse-charge reason to the VAT breakdown

  A reverse-charge VAT breakdown must state why no VAT is charged, as exemption reason text, a reason code, or both.

Intra-community supply (K) (4)

• BR-IC-02Add the seller and buyer VAT identifiers to an intra-community supply

  A document with an intra-community supply line (category K) needs a seller or tax representative VAT identifier and a buyer VAT identifier.

• BR-IC-10Add the intra-community supply reason to the VAT breakdown

  A VAT breakdown in category K must state the intra-community supply reason: the code VATEX-EU-IC, the matching reason text, or both.

• BR-IC-11Add a delivery date or invoicing period to an intra-community supply

  When the VAT breakdown includes category K, the document needs an actual delivery date or an invoicing period at document level.

• BR-IC-12Add the deliver-to country to an intra-community supply

  A document with a K VAT breakdown must give the country the goods were delivered to, in the deliver-to address under cac:Delivery/cac:DeliveryLocation.

Export outside the EU (G) (1)

• BR-G-02Add the seller VAT identifier to an export invoice

  A document with a line in category G, export outside the EU, needs a seller VAT identifier, or a tax representative one, under the VAT scheme.

Not subject to VAT (O) (4)

• BR-O-02Remove VAT identifiers from a document that is not subject to VAT

  When a line is category O, not subject to VAT, the document must not carry a VAT identifier for the seller, the buyer or a tax representative.

• BR-O-05Remove the VAT rate from a line that is not subject to VAT

  A line in category O must not have a cbc:Percent in its classified tax category, not even 0. Leave the rate out entirely.

• BR-O-10Add the not subject to VAT reason to the VAT breakdown

  A VAT breakdown in category O must say that the amount is not subject to VAT: the code VATEX-EU-O, reason text, or both.

• BR-O-11Keep amounts not subject to VAT on a separate invoice from other VAT categories

  A document with a VAT breakdown in category O may not have a breakdown in any other category. Out-of-scope and VAT-rated amounts need separate documents.

Business rules (PEPPOL-EN16931-R) (24)

• PEPPOL-EN16931-R001Add the missing business process identifier

  The document has no cbc:ProfileID. Add it directly under the root, after cbc:CustomizationID, with the Peppol Billing process identifier.

• PEPPOL-EN16931-R002Keep to one document-level note

  Peppol allows one cbc:Note directly under the root unless seller and buyer both have German postal addresses. Merge the texts into one note.

• PEPPOL-EN16931-R003Add a buyer reference or a purchase order reference

  The document has neither cbc:BuyerReference nor cac:OrderReference/cbc:ID. Peppol needs at least one so the buyer can route the invoice.

• PEPPOL-EN16931-R004Use the Peppol BIS Billing 3.0 specification identifier

  cbc:CustomizationID is missing or is not the Peppol BIS Billing 3.0 identifier. Send the Peppol value, not plain EN 16931 or another CIUS.

• PEPPOL-EN16931-R005Remove a VAT accounting currency that repeats the invoice currency

  cbc:TaxCurrencyCode is only for VAT accounted in a currency other than the invoice currency. Leave it out when the two would be the same.

• PEPPOL-EN16931-R007Use an approved business process identifier

  cbc:ProfileID must name a business process the Peppol rules recognise; for Billing, urn:fdc:peppol.eu:2017:poacc:billing:01:1.0, not a version.

• PEPPOL-EN16931-R008Remove empty elements from the document

  An element has no text and no child elements. Peppol does not allow empty elements: leave out any optional element you have no value for.

• PEPPOL-EN16931-R010Add the buyer electronic address

  Peppol requires a cbc:EndpointID inside the buyer Party. Only the presence of the element is tested; scheme and value are left to other rules.

• PEPPOL-EN16931-R020Add the seller electronic address

  Peppol requires a cbc:EndpointID inside the seller Party. The rule checks only that the element is there, not its scheme or value.

• PEPPOL-EN16931-R040Fix an allowance or charge amount that does not match its base amount and percentage

  When an allowance or charge states both a base amount and a percentage, its amount must be base times percentage over 100, within 0.02.

• PEPPOL-EN16931-R041Add the base amount to an allowance or charge that states a percentage

  An allowance or charge that gives a percentage must also give the base amount the percentage was applied to.

• PEPPOL-EN16931-R042Add the percentage to an allowance or charge that states a base amount

  An allowance or charge that gives a base amount must also give the percentage; a fixed-sum allowance or charge should carry neither.

• PEPPOL-EN16931-R043Write the charge indicator as true or false, not 1 or 0

  Peppol wants cbc:ChargeIndicator on document and line allowances and charges spelled as true or false. The schema also allows 1 and 0; Peppol does not.

• PEPPOL-EN16931-R044Mark the price-level adjustment as a discount, or move a surcharge out of the price

  Only a discount may sit in cac:Price/cac:AllowanceCharge, so its cbc:ChargeIndicator must be false. A surcharge goes in the net price or a line charge.

• PEPPOL-EN16931-R046Fix a net price that is not the gross price minus the price discount

  When a line price states a gross price, the net price must equal the gross price minus the price discount exactly. There is no tolerance.

• PEPPOL-EN16931-R051Use the invoice currency code in every amount currencyID

  An amount has a currencyID other than cbc:DocumentCurrencyCode. All amounts must be in the invoice currency, bar the VAT total in an accounting currency.

• PEPPOL-EN16931-R053Put the whole VAT breakdown in a single tax total

  The document must have exactly one cac:TaxTotal containing cac:TaxSubtotal elements. Put every VAT breakdown inside that one tax total.

• PEPPOL-EN16931-R054Send a tax total without a breakdown only with a VAT accounting currency

  A cac:TaxTotal with no cac:TaxSubtotal must appear exactly once when cbc:TaxCurrencyCode is given, and not at all when it is absent.

• PEPPOL-EN16931-R055Give the VAT total in the accounting currency the same sign as the invoice VAT total

  The VAT totals in the invoice currency and in the VAT accounting currency must not be on opposite sides of zero. Zero goes with either sign.

• PEPPOL-EN16931-R061Add the mandate reference to a direct debit

  Payment means 49 or 59 is a direct debit and needs cac:PaymentMandate/cbc:ID, the reference of the mandate the buyer signed.

• PEPPOL-EN16931-R110Start each line period on or after the invoicing period start date

  When the document has an invoicing period start date, no line period may start earlier. Correct the line date or start the document period earlier.

• PEPPOL-EN16931-R120Fix a line net amount that does not follow from quantity, price, charges and allowances

  Each line net amount must equal quantity x (net price / base quantity) + line charges - line allowances, within 0.02.

• PEPPOL-EN16931-R121Use a price base quantity above zero, or leave it out

  If a line price states a base quantity, it must be greater than zero. Zero and negative values fail; omitting the element is fine.

• PEPPOL-EN16931-R130Use the line quantity unit on the price base quantity

  When cac:Price/cbc:BaseQuantity has a unitCode, it must be the code used on the line quantity. Convert the price rather than relabel the unit.

Process and document type codes (PEPPOL-EN16931-P) (3)

• PEPPOL-EN16931-P0100Use an invoice type code that Peppol BIS Billing allows

  Peppol BIS Billing accepts only part of the UNTDID 1001 invoice codes. A code such as 325 (proforma) passes EN 16931 and fails here.

• PEPPOL-EN16931-P0101Use a credit note type code that Peppol BIS Billing allows

  In a Peppol credit note, cbc:CreditNoteTypeCode must be 381, 396, 81, 83 or 532. An invoice code such as 380 is rejected.

• PEPPOL-EN16931-P0106Pair the VATEX-EU-IC exemption code with category K

  The exemption reason code VATEX-EU-IC is reserved for intra-community supplies, category K. A tax category with any other code that carries it is rejected.

Formats (PEPPOL-EN16931-F) (1)

• PEPPOL-EN16931-F001Write dates as plain YYYY-MM-DD with no time zone

  Peppol dates must be exactly ten characters, YYYY-MM-DD. A time zone suffix such as Z or +01:00 passes the XSD but fails this rule.

Identifier checks (PEPPOL-COMMON) (1)

• PEPPOL-COMMON-R040Fix a GLN whose check digit is wrong

  An identifier with scheme 0088 must be all digits and end in the correct GS1 check digit. 7300010000001 passes; 7300010000002 does not.

Netherlands (NL) (3)

• NL-R-001Reference the corrected invoice on a credit note from a Dutch supplier

  When the seller address is in the Netherlands, a credit note must carry the number of the invoice it corrects in cac:BillingReference.

• NL-R-003Use scheme 0106 (KVK) or 0190 (OIN) for a Dutch seller legal identifier

  When the seller address is in the Netherlands, cac:PartyLegalEntity/cbc:CompanyID needs a value and schemeID 0106 (KVK) or 0190 (OIN).

• NL-R-007Add payment means when a Dutch supplier is owed money

  A seller in the Netherlands must include cac:PaymentMeans whenever the buyer has something to pay: an invoice due above zero or a credit note due below it.

Elements outside the model (UBL-CR) (3)

• UBL-CR-006Remove the issue time from the document

  Warning: cbc:IssueTime is outside the EN 16931 model. The invoice stays valid; drop the element and keep the issue date.

• UBL-CR-561Remove the tax total from invoice lines

  A cac:TaxTotal inside a line is not part of EN 16931 and draws a warning. The document stays valid; VAT belongs in the document-level breakdown.

• UBL-CR-682Move the delivery address into DeliveryLocation

  A warning: cac:Delivery/cac:DeliveryAddress is outside the invoice model. Write the deliver-to address as cac:Delivery/cac:DeliveryLocation/cac:Address.

Repetition limits (UBL-SR) (1)

• UBL-SR-53Add the CompanyID to a PartyTaxScheme, or remove the scheme

  Every cac:PartyTaxScheme must hold both a cbc:CompanyID and a cac:TaxScheme/cbc:ID. A tax scheme sent without the number it registers is rejected.

Data types (UBL-DT) (1)

• UBL-DT-01Write every amount with no more than two decimals

  An amount has more than two digits after the decimal point. Every amount element is limited to two, except the item net price and allowances on the price.

• FW-XML-001Fix XML that the parser refuses to read

  An Ironfang diagnostic, not an official rule: the XML is malformed, in an unsupported encoding, or uses DOCTYPE, entities or XInclude. Nothing else ran.