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BR-27: Item net price (BT-146) is negative

Official message

[BR-27] The Item net price (BT-146) shall NOT be negative.

EN 16931 (CII) · Error · Message language: English · Version: xrechnung-3.0.2-validator-configuration-2026-08-31

[BR-27] The Item net price (BT-146) shall NOT be negative.

EN 16931 (UBL) · Error · Message language: English · Version: xrechnung-3.0.2-validator-configuration-2026-08-31

[BR-27] The Item net price (BT-146) shall NOT be negative.

Factur-X / ZUGFeRD EN 16931 · Error · Message language: English · Version: Factur-X 1.08 / ZUGFeRD 2.4
Severity
Error The invoice is invalid and may be rejected by the recipient.
Applies to
EN 16931 (CII), EN 16931 (UBL), Factur-X / ZUGFeRD EN 16931
Affected fields
BT-146

What does this mean?

The item net price (BT-146) shall not be negative. It is less than 0 for at least one line.

Typical causes

A credit, return or discount was entered as a line with a negative price.
A deposit or returnable packaging amount was deducted with a negative price.

How to fix the error

State the price as a positive value. If the line is to reduce the invoice amount, state a negative quantity (BT-129); the line net amount (BT-131) then becomes negative.
Alternatively state discounts as an invoice line allowance (BG-27) or a document level allowance (BG-20).
CII: ram:SpecifiedLineTradeAgreement/ram:NetPriceProductTradePrice/ram:ChargeAmount, UBL: cac:InvoiceLine/cac:Price/cbc:PriceAmount.
Generate and validate the invoice again.

In E-Rechnungsfreund

In the invoice form, section "Rechnungspositionen (BG-25)" (invoice lines), enter a value of 0 or more in the field "Nettopreis (BT-146)" (net price); negative prices are not saved. For a reducing line enter a negative "Menge (BT-129)" (quantity).

Example

Wrong

<ram:IncludedSupplyChainTradeLineItem>
  ...
  <ram:SpecifiedLineTradeAgreement>
    <ram:NetPriceProductTradePrice>
      <ram:ChargeAmount>-50.00</ram:ChargeAmount>
    </ram:NetPriceProductTradePrice>
  </ram:SpecifiedLineTradeAgreement>
  <ram:SpecifiedLineTradeDelivery>
    <ram:BilledQuantity unitCode="C62">1</ram:BilledQuantity>
  </ram:SpecifiedLineTradeDelivery>
  ...
</ram:IncludedSupplyChainTradeLineItem>

Correct

<ram:IncludedSupplyChainTradeLineItem>
  ...
  <ram:SpecifiedLineTradeAgreement>
    <ram:NetPriceProductTradePrice>
      <ram:ChargeAmount>50.00</ram:ChargeAmount>
    </ram:NetPriceProductTradePrice>
  </ram:SpecifiedLineTradeAgreement>
  <ram:SpecifiedLineTradeDelivery>
    <ram:BilledQuantity unitCode="C62">-1</ram:BilledQuantity>
  </ram:SpecifiedLineTradeDelivery>
  ...
</ram:IncludedSupplyChainTradeLineItem>
For developers: test expression per syntax

EN 16931 (CII) (CII)

Context: //ram:IncludedSupplyChainTradeLineItem

(ram:SpecifiedLineTradeAgreement/ram:NetPriceProductTradePrice/ram:ChargeAmount) >= 0

EN 16931 (UBL) (UBL)

Context: cac:InvoiceLine | cac:CreditNoteLine

(cac:Price/cbc:PriceAmount) >= 0

Factur-X / ZUGFeRD EN 16931 (CII)

Technical ID in the source: FX-SCH-A-000206

Context: //ram:IncludedSupplyChainTradeLineItem

(ram:SpecifiedLineTradeAgreement/ram:NetPriceProductTradePrice/ram:ChargeAmount) >= 0

Related validation rules

  • BR-01: Specification identifier (BT-24) is missing
  • BR-02: Invoice number (BT-1) is missing
  • BR-03: Invoice issue date (BT-2) is missing
  • BR-04: Invoice type code (BT-3) is missing
  • BR-05: Invoice currency code (BT-5) is missing
  • BR-06: Seller name (BT-27) is missing

Frequently asked questions

How do I represent a return or credit line?

With a positive price and a negative quantity. The line net amount (BT-131) is then negative; negative line amounts are allowed in EN 16931, negative prices are not.

Last updated:
Explanation of the validation rule, not legal or tax advice.