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2 fatal errors

UBL syntax · EN 16931 (core)

fatalBR-CO-17

VAT category tax amount (BT-117) = VAT category taxable amount (BT-116) x (VAT category rate (BT-119) / 100), rounded to two decimals.

WhyIn a VAT breakdown group the VAT category tax amount (BT-117) does not equal the taxable amount (BT-116) multiplied by the rate (BT-119), rounded to 2 decimals.
How to fixSet BT-117 = round(BT-116 x BT-119 / 100, 2) per breakdown group. Round the product itself with half-up rounding - summing per-line VAT amounts drifts by a cent or two. BT-119 is a percentage (21, not 0.21). Note the EN core rule tolerates a deviation of up to 1.00 in the invoice currency, so if this fires your figure is off by more than a rounding cent - look for a wrong rate or a taxable amount that excludes an allowance. National profiles (XRechnung, Peppol BIS, KSeF) routinely tighten this to the exact cent.
  24     <cbc:TaxAmount currencyID="EUR">66.66</cbc:TaxAmount>
  25     <cac:TaxSubtotal>
  26       <cbc:TaxableAmount currencyID="EUR">333.30</cbc:TaxableAmount>
line 25 · /Invoice/TaxTotal/TaxSubtotal
fatalBR-S-09

The VAT category tax amount (BT-117) in a VAT breakdown (BG-23) where VAT category code (BT-118) is "Standard rated" shall equal the VAT category taxable amount (BT-116) multiplied by the VAT category rate (BT-119).

WhyIn the VAT breakdown group for standard rated VAT (category S), the VAT category tax amount (BT-117) does not equal the taxable amount (BT-116) times the rate (BT-119).
How to fixSet BT-117 = round(BT-116 x BT-119 / 100, 2) for the S group. This rule usually fires together with BR-CO-17 - fix the arithmetic once and both clear. If BT-116 itself is wrong, fix that first (see BR-S-08), because BT-117 is derived from it.
  27       <cbc:TaxAmount currencyID="EUR">66.66</cbc:TaxAmount>
  28       <cac:TaxCategory><cbc:ID>S</cbc:ID><cbc:Percent>22</cbc:Percent><cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme></cac:TaxCategory>
  29     </cac:TaxSubtotal>
line 28 · /Invoice/TaxTotal/TaxSubtotal/TaxCategory

1,722 rules explained

Every EN 16931 and Peppol BIS rule has its own reference page with the cause and the fix.

Hybrid PDFs, wrapper included

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Profiles that actually reject you

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Checked against the official corpus

Passes 1,142 of 1,142 assertions in CEN's own EN 16931 test suite — the same corpus the standard is validated with.

Who must comply, and when

Country-by-country mandate deadlines — Belgium, Poland, France, Germany, Slovenia and the rest.