BT-110 must equal the sum of all VAT category amounts (BG-23).
Derive the VAT total from the categories; with multiple rates, round each category and then sum.
BT-110 Invoice total VAT amountBT-117 VAT category tax amountBG-22 Document totalsBG-23 VAT breakdownThe Billhorse validator checks XRechnung, ZUGFeRD and Factur-X right in your browser — your file is never uploaded.
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Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).