E-invoice / Rules / BR-28

E-invoice rule EN 16931 schematron

BR-28: Line 1: the item gross price (BT-148)

Line 1: the item gross price (BT-148) must not be negative.

Original wording of the rule

[BR-28]-The Item gross price (BT-148) shall NOT be negative.

Source of the quotation: EN 16931 schematron (ConnectingEurope/eInvoicing-EN16931, licence EUPL 1.2)

How to fix it

1. Open the XML file and find the element cac:AllowanceCharge/cbc:BaseAmount.
2. Add or correct the element the way the wording of the rule above asks for.
3. Save the file and check it again with our checker. It runs in your browser, the file is never uploaded.

A correct UBL 2.1 snippet

<cac:AllowanceCharge
    xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2"
    xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2">
  <cbc:BaseAmount currencyID="EUR">100.00</cbc:BaseAmount>
</cac:AllowanceCharge>

The snippet is only the part of the document the rule is about. Put it in the right place inside your invoice; the namespaces are written here only so that the snippet reads on its own.

When it is reported

Profile: EN 16931, Peppol BIS Billing 3.0, XRechnung 3.x

How we rate it: error

Where we point in the file: /Invoice/cac:InvoiceLine[1]/cac:Price/cac:AllowanceCharge/cbc:BaseAmount

Related rules

• BR-26 Line 1 has no item net price (BT-146) in cac:Price/cbc:PriceAmount
• BR-27 Line 1: the item net price (BT-146) must not be negative
• BR-29 The end of the period (2026-08-31) is earlier than its start
• BR-30 The end of the period (2026-08-31) is earlier than its start
• BR-31 The allowance on document level has no amount

Our check is not complete: we do not check the XSD schema and we do not implement every rule, and a file that passes says nothing about whether the buyer or the Peppol network will accept it. Licences for the quoted wordings are listed in our sources.