`BR-27`

The Item net price (BT-146) shall NOT be negative.

Official rule text

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

[BR-27]-Preţul net al articolului (BT-146) trebuie să NU fie negativ. #The Item net price (BT-146) shall NOT be negative. ( … = ' … ')
CIUS-RO (1.0.9)

Where the rule applies

Rule set	Document type	Severity
XRechnung with the CEN EN 16931 rules (3.0.2) KoSIT, CEN	EN16931 XRechnung (UBL Invoice), EN16931 XRechnung Extension (UBL Invoice), EN16931 XRechnung CVD (UBL Invoice), EN16931 XRechnung (UBL CreditNote), EN16931 XRechnung CVD (UBL CreditNote), EN16931 XRechnung (CII), EN16931 XRechnung Extension (CII), EN16931 XRechnung CVD (CII), EN16931 (UBL Invoice), EN16931 (UBL CreditNote), EN16931 (CII)	fatal
ZUGFeRD / Factur-X (2.5.2) FeRD, FNFE-MPE	Factur-X BASIC (CII), Factur-X EN 16931 (CII)	error
Peppol BIS Billing 3.0 (3.0-2026.5) OpenPeppol	Peppol BIS Billing 3.0 (UBL Invoice), Peppol BIS Billing 3.0 (UBL CreditNote)	fatal
CIUS-RO (1.0.9) Romanian Ministry of Finance	CIUS-RO (UBL Invoice), CIUS-RO (UBL CreditNote), CIUS-RO (CII): EN 16931 only	fatal
HR-CIUS (eRačun) (1.0.4) Croatian Tax Administration	HR-CIUS (UBL Invoice), HR-CIUS (UBL CreditNote)	fatal

Fatal and error findings make the invoice invalid (valid: false); warnings and information do not.

Business terms concerned (EN 16931)

BT-146

Technical check

Syntax: UBL · HR-CIUS (eRačun) (1.0.4), Peppol BIS Billing 3.0 (3.0-2026.5), XRechnung with the CEN EN 16931 rules (3.0.2)
Context: cac:InvoiceLine | cac:CreditNoteLine
Test (must be true): (cac:Price/cbc:PriceAmount) >= 0

Syntax: CII · CIUS-RO (1.0.9), XRechnung with the CEN EN 16931 rules (3.0.2), ZUGFeRD / Factur-X (2.5.2)
Context: //ram:IncludedSupplyChainTradeLineItem
Test (must be true): (ram:SpecifiedLineTradeAgreement/ram:NetPriceProductTradePrice/ram:ChargeAmount) >= 0

Syntax: UBL · CIUS-RO (1.0.9)
Context: cbc:PriceAmount
Test (must be true): (.) >=0

How the API reports this rule

Every finding of POST /v1/validate carries the rule id, severity, message, location (XPath) and rule set, and links this page (docUrl):

{
  "severity": "fatal",
  "ruleId": "BR-27",
  "message": "[BR-27]-The Item net price (BT-146) shall NOT be negative.",
  "xpath": "/…",
  "source": "schematron:xrechnung@3.0.2",
  "docUrl": "https://einvoice-api.eu/rules/br-27.html"
}

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Rule text and severity are taken unchanged from the official rule set; this page is generated from the API's configuration. Not legal advice.