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EN 16931 rule reference

every code an invoice can be refused with, defined like a word.

Find the rule ID shown in your invoice error, such as BR-DE-15. Each page explains the affected field and the next correction. Codes beginning BT identify individual invoice fields; BG identifies a group of fields.

321 rules can be triggered by what you send. 2 additional pages document retired IDs for compatibility, so there are 323 pages here.

The payloads are not transcribed by hand: the site build executes the library and publishes what it returns, so a page cannot describe an error the code does not produce. Rules marked written up also carry the normative text, a worked example and a divergence note.

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These 54 rules have a written explanation: what went wrong on the invoice in plain words, what to change, and how our check differs from the official validator. The tables below list every rule.

BR-01 An invoice must state its specification identifier
BR-02 An invoice must have an invoice number
BR-03 An invoice must have an issue date
BR-05 An invoice must have a currency code
BR-16 An invoice must have at least one line
BR-51 An invoice may show at most the first six and last four card digits
BR-63 The buyer electronic address needs a scheme identifier
BR-AE-02 Reverse charge requires both parties to be identified
BR-CL-08 An invoice note subject code must come from UNCL 4451
BR-S-02 Charging standard-rate VAT requires a seller VAT identifier
BR-CO-09 VAT identifiers must carry a country prefix
BR-CO-10 The line net amounts must add up to the stated total
BR-CO-13 The total without VAT is the lines, minus allowances, plus charges
BR-CO-14 The total VAT is the sum of the VAT breakdown groups
BR-CO-15 The total with VAT is the net total plus the VAT total
BR-CO-16 The amount due is the gross total, less what is already paid
BR-CO-17 The VAT in each breakdown group must equal base × rate
BR-CO-26 The seller must be identifiable by something other than a name
BR-DE-1 XRechnung requires payment instructions
BR-DE-2 XRechnung requires seller contact details, all three of them
BR-DE-3 XRechnung requires the seller city
BR-DE-4 XRechnung requires the seller post code
BR-DE-5 XRechnung requires a seller contact point
BR-DE-6 XRechnung requires a seller telephone number
BR-DE-7 XRechnung requires a seller email address
BR-DE-8 XRechnung requires the buyer city
BR-DE-9 XRechnung requires the buyer post code
BR-DE-10 A delivery address needs a city
BR-DE-11 A delivery address needs a post code
BR-DE-14 XRechnung requires a VAT rate on every breakdown group
BR-DE-15 XRechnung requires a buyer reference
BR-DE-16 XRechnung requires a seller tax identifier for almost every category
BR-DE-17 XRechnung narrows the invoice type codes to eight
BR-DE-18 Skonto in the payment terms follows a fixed grammar
BR-DE-19 The IBAN on a SEPA credit transfer must check out
BR-DE-20 A SEPA direct debit needs a valid IBAN for the debited account
BR-DE-22 Attachment filenames must be unique
BR-DE-23-a A credit transfer code obliges the credit transfer group
BR-DE-23-b A credit transfer code rules out card and direct debit data
BR-DE-24-a A card payment code requires the card group
BR-DE-24-b A card payment code rules out transfer and direct debit data
BR-DE-25-a A direct debit code requires the direct debit group
BR-DE-25-b A direct debit code rules out transfer and card data
BR-DE-26 A corrected invoice must say what it corrects
BR-DE-27 The seller telephone number must be diallable
BR-DE-28 The seller email address must look like an email address
BR-DE-30 A direct debit needs the creditor identifier
BR-DE-31 A direct debit needs the account to be debited
BR-DE-TMP-32 Add the delivery date or service period
PEPPOL-COMMON-R053 A Danish SE number used as a Peppol identifier is DK and eight digits
PEPPOL-EN16931-R003 A Peppol invoice needs a buyer reference or an order reference
PEPPOL-EN16931-R010 A Peppol invoice needs the buyer electronic address
PEPPOL-EN16931-R061 A Peppol direct debit needs the mandate reference
ATW-DECLARED-TOTAL-NOT-A-NUMBER A stated total must be a number, written with a decimal point

EN 16931 core

Rule	Term	Requirement
`BR-01`	`BT-24`	An invoice must state its specification identifier written up
`BR-02`	`BT-1`	An invoice must have an invoice number written up
`BR-03`	`BT-2`	An invoice must have an issue date written up
`BR-04`	`BT-3`	An invoice must have an invoice type code
`BR-05`	`BT-5`	An invoice must have a currency code written up
`BR-06`	`BT-27`	An invoice must contain the seller name
`BR-07`	`BT-44`	An invoice must contain the buyer name
`BR-08`	`BG-5`	An invoice must contain the seller postal address
`BR-09`	`BT-40`	The seller postal address must include a country code
`BR-10`	`BG-8`	An invoice must contain the buyer postal address
`BR-11`	`BT-55`	The buyer postal address must include a country code
`BR-12`	`BT-106`	An invoice must state the sum of its line net amounts
`BR-13`	`BT-109`	An invoice must state its total amount without VAT
`BR-14`	`BT-112`	An invoice must state its total amount with VAT
`BR-15`	`BT-115`	An invoice must state the amount due for payment
`BR-16`	`BG-25`	An invoice must have at least one line written up
`BR-17`	`BT-59`	A separate payee must be named
`BR-18`	`BT-62`	A seller tax representative must be named
`BR-19`	`BG-12`	A seller tax representative must have a postal address
`BR-20`	`BT-69`	The tax representative’s address must include a country code
`BR-21`	`BT-126`	Every invoice line must have a line identifier
`BR-22`	`BT-129`	Every invoice line must have an invoiced quantity
`BR-23`	`BT-130`	Every invoice line must have a unit of measure code
`BR-24`	`BT-131`	Every invoice line must have a line net amount
`BR-25`	`BT-153`	Every invoice line must have an item name
`BR-26`	`BT-146`	Every invoice line must have an item net price
`BR-27`	`BT-146`	The item net price must not be negative
`BR-28`	`BT-148`	The item gross price must not be negative
`BR-29`	`BT-73 / BT-74`	The invoicing period must not end before it starts
`BR-30`	`BT-134 / BT-135`	An invoice line period must not end before it starts
`BR-31`	`BT-92`	Every document-level allowance must have an amount
`BR-32`	`BT-95`	Every document-level allowance must have a VAT category code
`BR-33`	`BT-97 / BT-98`	Every document-level allowance must state a reason or reason code
`BR-36`	`BT-99`	Every document-level charge must have an amount
`BR-37`	`BT-102`	Every document-level charge must have a VAT category code
`BR-38`	`BT-104 / BT-105`	Every document-level charge must state a reason or reason code
`BR-41`	`BT-136`	Every line allowance must have an amount
`BR-42`	`BT-139 / BT-140`	Every line allowance must state a reason or reason code
`BR-43`	`BT-141`	Every line charge must have an amount
`BR-44`	`BT-144 / BT-145`	Every line charge must state a reason or reason code
`BR-45`	`BT-116`	Each VAT breakdown group must state a taxable amount
`BR-46`	`BT-117`	Each VAT breakdown group must state a VAT amount
`BR-47`	`BT-118`	Each VAT breakdown group must have a VAT category code
`BR-48`	`BT-119`	Each VAT breakdown group must state a VAT rate, unless its category is O
`BR-49`	`BT-81`	Payment instructions must include a payment means code
`BR-50`	`BG-17 / BT-84`	Credit transfer details must include the account identifier
`BR-51`	`BT-87`	An invoice may show at most the first six and last four card digits written up
`BR-52`	`BT-122`	Every supporting document must have a reference
`BR-53`	`BT-111`	A VAT accounting currency requires the VAT total in that currency
`BR-54`	`BT-160 / BT-161`	Every item attribute must have both a name and a value
`BR-55`	`BT-25`	Every preceding invoice reference must give the invoice number
`BR-56`	`BT-63`	A seller tax representative must have a VAT identifier
`BR-57`	`BT-80`	A delivery address must include a country code
`BR-61`	`BT-84`	A credit transfer must state the account to pay into
`BR-62`	`BT-34`	The seller electronic address needs a scheme identifier
`BR-63`	`BT-49`	The buyer electronic address needs a scheme identifier written up
`BR-64`	`BT-157`	An item standard identifier needs a scheme identifier
`BR-65`	`BT-158`	An item classification code needs a scheme identifier

VAT category rules

Rule	Term	Requirement
`BR-AE-01`	`BT-118`	Reverse-charge items need a reverse-charge VAT breakdown group
`BR-AE-02`	`BT-31 / BT-32`	Reverse charge requires both parties to be identified written up
`BR-AE-03`	`BT-31 / BT-48`	A reverse-charge allowance requires both parties to be identified
`BR-AE-04`	`BT-31 / BT-48`	A charge under reverse charge requires both parties to be identified
`BR-AE-05`	`BT-152`	Reverse-charge lines must have a VAT rate of zero
`BR-AE-06`	`BT-96`	A reverse-charge allowance must have a VAT rate of zero
`BR-AE-07`	`BT-103`	A charge under reverse charge must have a VAT rate of zero
`BR-AE-08`	`BT-116`	Reverse-charge taxable amounts must match their lines, allowances and charges
`BR-AE-09`	`BT-117`	A reverse-charge VAT breakdown must show zero VAT
`BR-AE-10`	`BT-120 / BT-121`	A reverse-charge VAT breakdown must give the reverse-charge reason
`BR-AF-01`	`BT-118`	Canary Islands IGIC items need an IGIC VAT breakdown group
`BR-AF-02`	`BT-31 / BT-32`	Canary Islands IGIC lines require a seller or tax representative tax ID
`BR-AF-03`	`BT-31 / BT-32`	A Canary Islands IGIC allowance requires a seller or tax representative tax ID
`BR-AF-04`	`BT-31 / BT-32`	A Canary Islands IGIC charge requires a seller or tax representative tax ID
`BR-AF-05`	`BT-152`	Canary Islands IGIC lines must state a rate of zero or more
`BR-AF-06`	`BT-96`	A Canary Islands IGIC allowance must state a rate of zero or more
`BR-AF-07`	`BT-103`	A Canary Islands IGIC charge must state a rate of zero or more
`BR-AF-08`	`BT-116`	Canary Islands IGIC taxable amounts must match their lines, allowances and charges
`BR-AF-09`	`BT-117`	Canary Islands IGIC must equal the taxable amount times the rate
`BR-AF-10`	`BT-120 / BT-121`	A Canary Islands IGIC breakdown should not give an exemption reason
`BR-AG-01`	`BT-118`	Ceuta and Melilla IPSI items need an IPSI VAT breakdown group
`BR-AG-02`	`BT-31 / BT-32`	Ceuta and Melilla IPSI lines require a seller or tax representative tax ID
`BR-AG-03`	`BT-31 / BT-32`	A Ceuta and Melilla IPSI allowance requires a seller or tax representative tax ID
`BR-AG-04`	`BT-31 / BT-32`	A Ceuta and Melilla IPSI charge requires a seller or tax representative tax ID
`BR-AG-05`	`BT-152`	Ceuta and Melilla IPSI lines must state a rate of zero or more
`BR-AG-06`	`BT-96`	A Ceuta and Melilla IPSI allowance must state a rate of zero or more
`BR-AG-07`	`BT-103`	A Ceuta and Melilla IPSI charge must state a rate of zero or more
`BR-AG-08`	`BT-116`	Ceuta and Melilla IPSI taxable amounts must match their lines, allowances and charges
`BR-AG-09`	`BT-117`	Ceuta and Melilla IPSI must equal the taxable amount times the rate
`BR-AG-10`	`BT-120 / BT-121`	A Ceuta and Melilla IPSI breakdown should not give an exemption reason
`BR-CL-01`	`BT-3`	The document type code must be a UNTDID 1001 invoice or credit note code
`BR-CL-03`	`BT-5`	Every amount’s currency must be an ISO 4217 currency code
`BR-CL-04`	`BT-5`	The invoice currency must be an ISO 4217 currency code
`BR-CL-05`	`BT-6`	The VAT accounting currency must be an ISO 4217 currency code
`BR-CL-06`	`BT-8`	The VAT point date code must be one of the three codes EN 16931 allows
`BR-CL-07`	`BT-18`	The invoiced object identifier scheme must be a UNTDID 1153 code
`BR-CL-08`	`BT-21`	An invoice note subject code must come from UNCL 4451 written up
`BR-CL-10`	`BT-29`	A party identifier scheme must be an ISO 6523 ICD code
`BR-CL-11`	`BT-30`	A legal registration identifier scheme must be an ISO 6523 ICD code
`BR-CL-13`	`BT-158`	An item classification scheme must be a UNTDID 7143 code
`BR-CL-14`	`BT-40`	An address country code must be an ISO 3166-1 alpha-2 code
`BR-CL-15`	`BT-159`	An item’s country of origin must be an ISO 3166-1 alpha-2 code
`BR-CL-16`	`BT-81`	The payment means code must be a UNTDID 4461 code
`BR-CL-17`	`BT-118`	A VAT breakdown category code must be a UNTDID 5305 code
`BR-CL-18`	`BT-151`	A line VAT category code must be a UNTDID 5305 code
`BR-CL-19`	`BT-98`	An allowance reason code must be a UNCL 5189 code
`BR-CL-20`	`BT-105`	A charge reason code must be a UNCL 7161 code
`BR-CL-21`	`BT-157`	An item standard identifier scheme must be an ISO 6523 ICD code
`BR-CL-22`	`BT-121`	A VAT exemption reason code must come from the CEF VATEX list
`BR-CL-23`	`BT-130`	A unit of measure must be a UN/ECE Recommendation 20 code
`BR-CL-24`	`BT-125`	An attachment must use one of the MIME types EN 16931 allows
`BR-CL-25`	`BT-34`	An electronic address scheme must be a CEF EAS code
`BR-CL-26`	`BT-71`	A delivery location identifier scheme must be an ISO 6523 ICD code
`BR-DEC-01`	`BT-92`	A document-level allowance amount may have at most two decimals
`BR-DEC-02`	`BT-93`	A document-level allowance base amount may have at most two decimals
`BR-DEC-05`	`BT-99`	A document-level charge amount may have at most two decimals
`BR-DEC-06`	`BT-100`	A document-level charge base amount may have at most two decimals
`BR-DEC-09`	`BT-106`	The sum of line net amounts may have at most two decimals
`BR-DEC-10`	`BT-107`	The sum of document-level allowances may have at most two decimals
`BR-DEC-11`	`BT-108`	The sum of document-level charges may have at most two decimals
`BR-DEC-12`	`BT-109`	The total amount without VAT may have at most two decimals
`BR-DEC-13`	`BT-110`	The total VAT amount may have at most two decimals
`BR-DEC-14`	`BT-112`	The total amount with VAT may have at most two decimals
`BR-DEC-15`	`BT-111`	The VAT total in accounting currency may have at most two decimals
`BR-DEC-16`	`BT-113`	The paid amount may have at most two decimals
`BR-DEC-17`	`BT-114`	The rounding amount may have at most two decimals
`BR-DEC-18`	`BT-115`	The amount due for payment may have at most two decimals
`BR-DEC-19`	`BT-116`	A VAT category taxable amount may have at most two decimals
`BR-DEC-20`	`BT-117`	A VAT category tax amount may have at most two decimals
`BR-DEC-23`	`BT-131`	An invoice line net amount may have at most two decimals
`BR-DEC-24`	`BT-136`	A line allowance amount may have at most two decimals
`BR-DEC-25`	`BT-137`	A line allowance base amount may have at most two decimals
`BR-DEC-27`	`BT-141`	A line charge amount may have at most two decimals
`BR-DEC-28`	`BT-142`	A line charge base amount may have at most two decimals
`BR-E-01`	`BT-118`	VAT-exempt items need an exempt VAT breakdown group
`BR-E-02`	`BT-31 / BT-32`	Exempt lines require a seller or tax representative tax ID
`BR-E-03`	`BT-31 / BT-32`	A VAT-exempt allowance requires a seller or tax representative tax ID
`BR-E-04`	`BT-31 / BT-32`	A VAT-exempt charge requires a seller or tax representative tax ID
`BR-E-05`	`BT-152`	Exempt lines must have a VAT rate of zero
`BR-E-06`	`BT-96`	A VAT-exempt allowance must have a VAT rate of zero
`BR-E-07`	`BT-103`	A VAT-exempt charge must have a VAT rate of zero
`BR-E-08`	`BT-116`	Exempt taxable amounts must match their lines, allowances and charges
`BR-E-09`	`BT-117`	An exempt VAT breakdown must show zero VAT
`BR-E-10`	`BT-120 / BT-121`	An exempt VAT breakdown must give an exemption reason
`BR-G-01`	`BT-118`	Exports need an export VAT breakdown group
`BR-G-02`	`BT-31 / BT-63`	Export lines require a seller or tax representative VAT ID
`BR-G-03`	`BT-31 / BT-63`	An export allowance requires a seller or tax representative VAT ID
`BR-G-04`	`BT-31 / BT-63`	An export charge requires a seller or tax representative VAT ID
`BR-G-05`	`BT-152`	Export lines must have a VAT rate of zero
`BR-G-06`	`BT-96`	An export allowance must have a VAT rate of zero
`BR-G-07`	`BT-103`	An export charge must have a VAT rate of zero
`BR-G-08`	`BT-116`	Export taxable amounts must match their lines, allowances and charges
`BR-G-09`	`BT-117`	An export VAT breakdown must show zero VAT
`BR-G-10`	`BT-120 / BT-121`	An export VAT breakdown must give the export exemption reason
`BR-IC-01`	`BT-118`	Intra-community supplies need an intra-community VAT breakdown group
`BR-IC-02`	`BT-31 / BT-63`	Intra-community supply lines require a buyer VAT ID and a seller or representative VAT ID
`BR-IC-03`	`BT-31 / BT-48`	An intra-community allowance requires a buyer VAT ID and a seller or representative VAT ID
`BR-IC-04`	`BT-31 / BT-48`	An intra-community charge requires a buyer VAT ID and a seller or representative VAT ID
`BR-IC-05`	`BT-152`	Intra-community supply lines must have a VAT rate of zero
`BR-IC-06`	`BT-96`	An intra-community allowance must have a VAT rate of zero
`BR-IC-07`	`BT-103`	An intra-community charge must have a VAT rate of zero
`BR-IC-08`	`BT-116`	Intra-community supply taxable amounts must match their lines, allowances and charges
`BR-IC-09`	`BT-117`	An intra-community VAT breakdown must show zero VAT
`BR-IC-10`	`BT-120 / BT-121`	An intra-community VAT breakdown must give the matching exemption reason
`BR-IC-11`	`BT-72`	An intra-community supply must state a delivery date or invoicing period
`BR-IC-12`	`BT-80`	An intra-community supply must state the deliver-to country
`BR-O-01`	`BT-118`	Items not subject to VAT need a matching VAT breakdown group
`BR-O-02`	`BT-31 / BT-48`	Lines not subject to VAT rule out VAT identifiers on the invoice
`BR-O-03`	`BT-31 / BT-48`	An allowance not subject to VAT rules out VAT identifiers on the invoice
`BR-O-04`	`BT-31 / BT-48`	A charge not subject to VAT rules out VAT identifiers on the invoice
`BR-O-05`	`BT-152`	Lines not subject to VAT must not have a VAT rate at all
`BR-O-06`	`BT-96`	An allowance not subject to VAT must not have a VAT rate at all
`BR-O-07`	`BT-103`	A charge not subject to VAT must not have a VAT rate at all
`BR-O-08`	`BT-116`	Not-subject-to-VAT taxable amounts must match their lines, allowances and charges
`BR-O-09`	`BT-117`	A not-subject-to-VAT breakdown must show zero VAT
`BR-O-10`	`BT-120 / BT-121`	A not-subject-to-VAT breakdown must give the matching exemption reason
`BR-O-11`	`BT-118`	A not-subject-to-VAT invoice can have no other VAT breakdown group
`BR-O-12`	`BT-151`	On a not-subject-to-VAT invoice, every line must be not subject to VAT
`BR-O-13`	`BT-95`	On a not-subject-to-VAT invoice, every allowance must be not subject to VAT
`BR-O-14`	`BT-102`	On a not-subject-to-VAT invoice, every charge must be not subject to VAT
`BR-S-01`	`BT-118`	Standard-rated items need a standard-rated VAT breakdown group
`BR-S-02`	`BT-31 / BT-32`	Charging standard-rate VAT requires a seller VAT identifier written up
`BR-S-03`	`BT-31 / BT-32`	A standard-rated allowance requires a seller or tax representative tax ID
`BR-S-04`	`BT-31 / BT-32`	A standard-rated charge requires a seller or tax representative tax ID
`BR-S-05`	`BT-152`	Standard-rated lines must have a VAT rate above zero
`BR-S-06`	`BT-96`	A standard-rated allowance must have a VAT rate above zero
`BR-S-07`	`BT-103`	A standard-rated charge must have a VAT rate above zero
`BR-S-08`	`BT-116`	Standard-rated taxable amounts must match their lines, allowances and charges
`BR-S-09`	`BT-117`	Standard-rated VAT must equal the taxable amount times the rate
`BR-S-10`	`BT-120 / BT-121`	A standard-rated VAT breakdown should not give an exemption reason
`BR-Z-01`	`BT-118`	Zero-rated items need a zero-rated VAT breakdown group
`BR-Z-02`	`BT-31 / BT-32`	Zero-rated lines require a seller or tax representative tax ID
`BR-Z-03`	`BT-31 / BT-32`	A zero-rated allowance requires a seller or tax representative tax ID
`BR-Z-04`	`BT-31 / BT-32`	A zero-rated charge requires a seller or tax representative tax ID
`BR-Z-05`	`BT-152`	Zero-rated lines must have a VAT rate of zero
`BR-Z-06`	`BT-96`	A zero-rated allowance must have a VAT rate of zero
`BR-Z-07`	`BT-103`	A zero-rated charge must have a VAT rate of zero
`BR-Z-08`	`BT-116`	Zero-rated taxable amounts must match their lines, allowances and charges
`BR-Z-09`	`BT-117`	A zero-rated VAT breakdown must show zero VAT
`BR-Z-10`	`BT-120 / BT-121`	A zero-rated VAT breakdown should not give an exemption reason

Conditions and calculations

Rule	Term	Requirement
`BR-CO-03`	`BT-7 / BT-8`	The VAT point may be given as a date or as a code, not both
`BR-CO-04`	`BT-151`	Every invoice line must have a VAT category code
`BR-CO-09`	`BT-31`	VAT identifiers must carry a country prefix written up
`BR-CO-10`	`BT-106`	The line net amounts must add up to the stated total written up
`BR-CO-11`	`BT-107`	The allowance total must equal the sum of document-level allowances
`BR-CO-12`	`BT-108`	The charge total must equal the sum of document-level charges
`BR-CO-13`	`BT-109`	The total without VAT is the lines, minus allowances, plus charges written up
`BR-CO-14`	`BT-110`	The total VAT is the sum of the VAT breakdown groups written up
`BR-CO-15`	`BT-112`	The total with VAT is the net total plus the VAT total written up
`BR-CO-16`	`BT-115`	The amount due is the gross total, less what is already paid written up
`BR-CO-17`	`BT-117`	The VAT in each breakdown group must equal base × rate written up
`BR-CO-18`	`BG-23`	An invoice must have at least one VAT breakdown group
`BR-CO-19`	`BG-14`	An invoicing period must give a start date, an end date or a VAT point code
`BR-CO-20`	`BG-26`	An invoice line period must have a start date, an end date or both
`BR-CO-21`	`BT-97 / BT-98`	A document-level allowance needs a reason, a reason code, or both
`BR-CO-22`	`BT-104 / BT-105`	A document-level charge needs a reason, a reason code, or both
`BR-CO-23`	`BT-139 / BT-140`	A line allowance needs a reason, a reason code, or both
`BR-CO-24`	`BT-144 / BT-145`	A line charge needs a reason, a reason code, or both
`BR-CO-26`	`BT-29 / BT-30 / BT-31`	The seller must be identifiable by something other than a name written up

XRechnung (German CIUS)

Rule	Term	Requirement
`BR-DE-1`	`BG-16`	XRechnung requires payment instructions written up
`BR-DE-2`	`BG-6`	XRechnung requires seller contact details, all three of them written up
`BR-DE-3`	`BT-37`	XRechnung requires the seller city written up
`BR-DE-4`	`BT-38`	XRechnung requires the seller post code written up
`BR-DE-5`	`BT-41`	XRechnung requires a seller contact point written up
`BR-DE-6`	`BT-42`	XRechnung requires a seller telephone number written up
`BR-DE-7`	`BT-43`	XRechnung requires a seller email address written up
`BR-DE-8`	`BT-52`	XRechnung requires the buyer city written up
`BR-DE-9`	`BT-53`	XRechnung requires the buyer post code written up
`BR-DE-10`	`BT-77`	A delivery address needs a city written up
`BR-DE-11`	`BT-78`	A delivery address needs a post code written up
`BR-DE-14`	`BT-119`	XRechnung requires a VAT rate on every breakdown group written up
`BR-DE-15`	`BT-10`	XRechnung requires a buyer reference written up
`BR-DE-16`	`BT-31 / BT-32`	XRechnung requires a seller tax identifier for almost every category written up
`BR-DE-17`	`BT-3`	XRechnung narrows the invoice type codes to eight written up
`BR-DE-18`	`BT-20`	Skonto in the payment terms follows a fixed grammar written up
`BR-DE-19`	`BT-84`	The IBAN on a SEPA credit transfer must check out written up
`BR-DE-20`	`BT-91`	A SEPA direct debit needs a valid IBAN for the debited account written up
`BR-DE-22`	`BG-24 / BT-125`	Attachment filenames must be unique written up
`BR-DE-23-a`	`BG-17 / BT-84`	A credit transfer code obliges the credit transfer group written up
`BR-DE-23-b`	`BG-18`	A credit transfer code rules out card and direct debit data written up
`BR-DE-24-a`	`BG-18`	A card payment code requires the card group written up
`BR-DE-24-b`	`BG-17 / BG-19`	A card payment code rules out transfer and direct debit data written up
`BR-DE-25-a`	`BG-19`	A direct debit code requires the direct debit group written up
`BR-DE-25-b`	`BG-17`	A direct debit code rules out transfer and card data written up
`BR-DE-26`	`BG-3 / BT-25`	A corrected invoice must say what it corrects written up
`BR-DE-27`	`BT-42`	The seller telephone number must be diallable written up
`BR-DE-28`	`BT-43`	The seller email address must look like an email address written up
`BR-DE-30`	`BG-19 / BT-90`	A direct debit needs the creditor identifier written up
`BR-DE-31`	`BG-19 / BT-91`	A direct debit needs the account to be debited written up
`BR-DE-TMP-32`	`BT-72 / BG-14`	Add the delivery date or service period written up

Peppol BIS 3

Rule	Term	Requirement
`PEPPOL-COMMON-R040`	`BT-34`	A GLN must be all digits with a valid check digit
`PEPPOL-COMMON-R041`	`BT-34`	A Norwegian organisation number must be nine digits with a valid check digit
`PEPPOL-COMMON-R042`	`BT-34`	A Danish CVR number must be eight digits, optionally prefixed DK
`PEPPOL-COMMON-R043`	`BT-34`	A Belgian enterprise number must be ten digits with valid check digits
`PEPPOL-COMMON-R044`	`BT-34`	An Italian IPA code should be exactly six letters or digits
`PEPPOL-COMMON-R045`	`BT-29`	An Italian Codice Fiscale under scheme 0210 should be well formed
`PEPPOL-COMMON-R046`	`BT-34`	An Italian Codice Fiscale under scheme 9907 should be well formed
`PEPPOL-COMMON-R047`	`BT-46`	An Italian VAT number under scheme 0211 should be well formed
`PEPPOL-COMMON-R048`	`BT-34 / BT-49`	Retired — Peppol dropped scheme 9906 and this rule with it written up
`PEPPOL-COMMON-R049`	`BT-34`	A Swedish organisation number must be ten digits with a valid check digit
`PEPPOL-COMMON-R050`	`BT-34`	An Australian Business Number must be eleven digits with a valid checksum
`PEPPOL-COMMON-R052`	`BT-29`	A Danish P-number must be exactly ten digits
`PEPPOL-COMMON-R053`	`BT-46`	A Danish SE number used as a Peppol identifier is DK and eight digits written up
`PEPPOL-COMMON-R054`	`BT-30`	A Dutch KVK number under scheme 0106 should be exactly eight digits
`PEPPOL-COMMON-R055`	`BT-49`	A Dutch OIN under scheme 0190 should be exactly twenty digits
`PEPPOL-COMMON-R057`	`BT-29`	A Dutch establishment number under scheme 0217 should be exactly twelve digits
`PEPPOL-COMMON-R056-1`	`BT-34`	A Dutch VAT number under scheme 9944 should be NL, nine digits, B and two digits
`PEPPOL-COMMON-R056-2`	`BT-48`	A VAT identifier that starts with NL should be NL, nine digits, B and two digits
`PEPPOL-EN16931-CL007`	`BT-5`	The invoice currency must be on Peppol’s ISO 4217 list
`PEPPOL-EN16931-CL008`	`BT-34`	An electronic address scheme must be on Peppol’s scheme list
`PEPPOL-EN16931-F001`	`BT-2`	Peppol requires every date to be a real YYYY-MM-DD date
`PEPPOL-EN16931-P0100`	`BT-3`	The invoice type code must be one Peppol billing allows
`PEPPOL-EN16931-P0101`	`BT-3`	A credit note type code must be one Peppol billing allows
`PEPPOL-EN16931-P0104`	`BT-121 / BT-118`	The VATEX-EU-G exemption code is only for export outside the EU
`PEPPOL-EN16931-P0105`	`BT-121 / BT-118`	The VATEX-EU-O exemption code is only for supplies not subject to VAT
`PEPPOL-EN16931-P0106`	`BT-121 / BT-118`	The VATEX-EU-IC exemption code is only for intra-community supply
`PEPPOL-EN16931-P0107`	`BT-121 / BT-118`	The VATEX-EU-AE exemption code is only for reverse charge
`PEPPOL-EN16931-P0108`	`BT-121 / BT-118`	The VATEX-EU-D exemption code is only for exempt supplies
`PEPPOL-EN16931-P0109`	`BT-121 / BT-118`	The VATEX-EU-F exemption code is only for exempt supplies
`PEPPOL-EN16931-P0110`	`BT-121 / BT-118`	The VATEX-EU-I exemption code is only for exempt supplies
`PEPPOL-EN16931-P0111`	`BT-121 / BT-118`	The VATEX-EU-J exemption code is only for exempt supplies
`PEPPOL-EN16931-P0112`	`BT-3 / BT-40 / BT-55`	Peppol allows type codes 326 and 384 only between German parties
`PEPPOL-EN16931-R002`	`BT-21`	Peppol's CII binding allows no subject code on the document note
`PEPPOL-EN16931-R003`	`BT-10 / BT-13`	A Peppol invoice needs a buyer reference or an order reference written up
`PEPPOL-EN16931-R005`	`BT-6 / BT-5`	The VAT accounting currency must differ from the invoice currency
`PEPPOL-EN16931-R010`	`BT-49`	A Peppol invoice needs the buyer electronic address written up
`PEPPOL-EN16931-R020`	`BT-34`	A Peppol invoice should give the seller electronic address
`PEPPOL-EN16931-R040`	`BT-92 / BT-93 / BT-94`	An allowance or charge amount must equal base amount × percentage
`PEPPOL-EN16931-R041`	`BT-93 / BT-94`	An allowance or charge percentage requires a base amount
`PEPPOL-EN16931-R042`	`BT-100 / BT-101`	An allowance or charge base amount requires a percentage
`PEPPOL-EN16931-R046`	`BT-146 / BT-147 / BT-148`	The item net price must equal the gross price less the discount
`PEPPOL-EN16931-R055`	`BT-110 / BT-111`	The VAT total and its accounting-currency amount must share a sign
`PEPPOL-EN16931-R061`	`BT-89`	A Peppol direct debit needs the mandate reference written up
`PEPPOL-EN16931-R110`	`BT-134 / BT-73`	A line period must not start before the invoicing period
`PEPPOL-EN16931-R111`	`BT-135 / BT-74`	A line period must not end after the invoicing period
`PEPPOL-EN16931-R120`	`BT-131`	The line net amount must equal quantity × price, less allowances, plus charges
`PEPPOL-EN16931-R121`	`BT-149`	The item price base quantity must be greater than zero

Other

ATW-AMOUNT-OUT-OF-RANGE — No amount or total may exceed 999,999,999,999.99
ATW-BIC-INVALID — A BIC must be 8 or 11 capital letters and digits
ATW-CREDIT-NOTE-DUE-DATE-UNBOUND — A UBL credit note can carry a due date only with payment instructions
ATW-CREDIT-NOTE-NEGATIVE-AMOUNTS — A credit note should state its amounts as positive figures
ATW-CREDIT-NOTE-NO-PRECEDING-INVOICE — A credit note should name the invoice it credits
ATW-CREDIT-NOTE-PROJECT-REFERENCE-UNBOUND — A UBL credit note cannot carry a project reference
ATW-CREDIT-NOTE-UNSUPPORTED — Retired — credit notes are supported now
ATW-DATE-NOT-A-CALENDAR-DATE — Every date must be a real calendar date written as YYYY-MM-DD
ATW-DECLARED-TOTAL-NOT-A-NUMBER — A stated total must be a number, written with a decimal point
ATW-DECLARED-TOTAL-NOT-FINITE — A declared document total must be a finite number
ATW-IBAN-INVALID — An IBAN must have its country's length and valid check digits
ATW-INPUT-TYPE — Every field must have the type the input model expects
ATW-LEITWEG-ID-INVALID — A Leitweg-ID must have the form and check digits its specification sets
ATW-NUMBER-NOT-FINITE — Every number in the invoice must be finite
ATW-NUMBER-TOO-LARGE — A number is too large to write or compute exactly
ATW-PAYMENT-MEANS-INFERRED — An unstated payment means code is inferred from the account it is paid to
ATW-PROFILE-UNKNOWN — The profile must be one this library knows
ATW-SIREN-INVALID — A SIREN must be nine digits with a valid check digit
ATW-SIRET-INVALID — A SIRET must be fourteen digits with valid check digits
ATW-TEXT-NOT-XML — Text must contain only characters an XML document can carry
ATW-VAT-CATEGORY-UNSUPPORTED — Split-payment VAT (category B) is not supported by this library
ATW-VAT-RATE-FRACTION — A VAT rate is a percentage: 19% is 19, not 0.19
ATW-VAT-RATE-OUT-OF-RANGE — A VAT rate must be between -100% and 100%
ATW-VAT-SCENARIO-APPLIED — A stated vatScenario is turned into its EN 16931 VAT category and rate
ATW-VAT-SCENARIO-CONFLICT — A line must not state both a vatScenario and a different VAT category of its own
ATW-VAT-SCENARIO-FACT-MISSING — A vatScenario needs a fact the invoice does not state
ATW-VAT-SCENARIO-UNKNOWN — A vatScenario must be one of the five scenarios this build knows
ATW-VAT-SCENARIO-UNSUPPORTED — The small-business exemption scenario is implemented for Germany and France only

How to read these pages

Rule ID: BR-* is EN 16931 core, BR-CO-* a cross-field condition, BR-DE-* the German XRechnung CIUS, BR-<category>-* a VAT-category rule, PEPPOL-* a Peppol BIS 3 restriction.
Term: The business term the rule constrains: BT-* a field, BG-* a group.
Severity: fatal means the document is non-conformant and will be rejected. warning means it is conformant but likely to cause a downstream problem — KoSIT's own warnings map to this. information is advisory: the official validator raises it and then accepts the invoice.
Divergence: Where our check is not the same assertion as the published rule. Read it: several of our input-level checks are deliberately stricter, and a few are narrower.