Counterfoil rule note
Quoted from a public specification. This page is not a validator, and it is not tax, legal, or accounting advice.
For each different value of VAT category rate (BT-119) where the VAT category code (BT-118) is "IPSI", the VAT category taxable amount (BT-116) in a VAT breakdown (BG-23) shall equal the sum of Invoice line net amounts (BT-131) plus the sum of document level charge amounts (BT-99) minus the sum of document level allowance amounts (BT-92) where the VAT category code (BT-151, BT-102, BT-95) is "IPSI" and the VAT rate (BT-152, BT-103, BT-96) equals the VAT category rate (BT-119).
Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/BR-AG-08/
Peppol BIS Billing 3.0, May 2026 release, EN 16931 model bound to UBL
Severity note: fatal, from the Flag column of the Peppol BIS Billing 3.0 UBL rules index retrieved 2026-10-18.
For each VAT category rate (BT-119) where the VAT category code (BT-118) is "IPSI", the VAT category taxable amount (BT-116) must equal the sum of Invoice line net amounts (BT-131) plus document level charge amounts (BT-99) minus document level allowance amounts (BT-92) at that same rate. The published test compares category code M and allows the taxable amount and that sum to differ by less than 1. It is not exact equality. The line percent comparison is =$rate with no space around =. The allowance and charge percent comparisons are = $rate with spaces. The invoice branch calls exists(//cac:InvoiceLine) and the credit-note branch calls exists(//cac:CreditNoteLine). Neither exists check filters the category code.
Set BT-116 on each M breakdown to the M line net amounts at that rate, plus the M charges at that rate, minus the M allowances at that rate. The published test allows a difference of less than 1.
Illustration of the condition in the official statement. Not an example published by the source.
Fails the stated condition. M lines net to 100 at one rate, there is no M allowance or charge at that rate, and the M breakdown taxable amount at that rate is 50.
Passes the stated condition. M lines net to 100 at one rate, there is no M allowance or charge at that rate, and the M breakdown taxable amount at that rate is 100.
Copied from the source. Not reimplemented on this page.
/*/cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory[normalize-space(cbc:ID) = 'M'][cac:TaxScheme/normalize-space(upper-case(cbc:ID))='VAT']
every $rate in xs:decimal(cbc:Percent) satisfies ((exists(//cac:InvoiceLine) and ((../xs:decimal(cbc:TaxableAmount - 1) < (sum(../../../cac:InvoiceLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID)='M'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]/xs:decimal(cbc:LineExtensionAmount)) + sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=true()][cac:TaxCategory/normalize-space(cbc:ID)='M'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)) - sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=false()][cac:TaxCategory/normalize-space(cbc:ID)='M'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)))) and (../xs:decimal(cbc:TaxableAmount + 1) > (sum(../../../cac:InvoiceLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID)='M'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]/xs:decimal(cbc:LineExtensionAmount)) + sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=true()][cac:TaxCategory/normalize-space(cbc:ID)='M'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)) - sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=false()][cac:TaxCategory/normalize-space(cbc:ID)='M'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)))))) or (exists(//cac:CreditNoteLine) and ((../xs:decimal(cbc:TaxableAmount - 1) < (sum(../../../cac:CreditNoteLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID)='M'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]/xs:decimal(cbc:LineExtensionAmount)) + sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=true()][cac:TaxCategory/normalize-space(cbc:ID)='M'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)) - sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=false()][cac:TaxCategory/normalize-space(cbc:ID)='M'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)))) and (../xs:decimal(cbc:TaxableAmount + 1) > (sum(../../../cac:CreditNoteLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID)='M'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]/xs:decimal(cbc:LineExtensionAmount)) + sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=true()][cac:TaxCategory/normalize-space(cbc:ID)='M'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)) - sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=false()][cac:TaxCategory/normalize-space(cbc:ID)='M'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)))))))
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