BT-115 = BT-112 − prepaid (BT-113) + rounding (BT-114).
Declare prepayments explicitly in BT-113 — otherwise the amount due won't match the total.
BT-112 Invoice total with VATBT-113 Paid amountBT-114 Rounding amountBT-115 Amount due for paymentBG-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-*).