BT-109 = BT-106 − allowances (BT-107) + charges (BT-108).
Include document-level allowances/charges in the formula; treat missing BT-107/108 as zero.
BT-106 Sum of Invoice line net amountBT-107 Sum of allowances on document levelBT-108 Sum of charges on document levelBT-109 Invoice total amount without VATBG-22 Document totalsThe 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-*).