UBL-CR-647: Lines should not use an item price extension

What it means

This rule checks that no line of the invoice or credit note has a cac:ItemPriceExtension block. In UBL that block holds an extended price for the line, which can come with its own VAT total. EN 16931 has no such field. A line carries its amount excluding VAT (BT-131), while VAT is summarised in the VAT breakdown.

Why it matters

EN 16931 does not use cac:ItemPriceExtension on invoice or credit note lines. The line amount excluding VAT (BT-131) has its own field.

How to fix it

Remove cac:ItemPriceExtension from each cac:InvoiceLine or cac:CreditNoteLine that contains it. Keep the line amount excluding VAT (BT-131) in cbc:LineExtensionAmount. If your software adds the unwanted block, ask its supplier to correct the export, then check the new file again.

The rule as published

A UBL invoice should not include the InvoiceLine ItemPriceExtension

Where this rule applies