Rule BR-22
Each invoice line must have a quantity
Every line carries the quantity being invoiced.
Business term BT-129, Invoiced quantity. Source: EN 16931. Our wording, not the normative text, which is published in the Peppol BIS Billing 3.0 rule list and was checked against it on 2026-08-16.
Why it fires on invoices that look fine
Almost nobody hits this rule because they forgot the field exists. They hit it because something between their system and the document dropped it, changed its shape, or filled it with a value that is right somewhere else. These are the causes worth checking first.
- The line is a flat fee or a subscription and the quantity was left out as meaningless. The rule still requires one.
- The quantity is zero and a filter dropped the field rather than the value.
- The quantity is expressed as text with a unit inside it, such as "2 days", where the field takes a number and the unit is a separate field.
What to change
- For a flat fee, send a quantity of 1 and put the whole amount in the line net amount.
- Negative quantities are allowed and are the normal way to express a returned item on an invoice, so do not filter them out.
The validator runs in your browser. Nothing is uploaded, and you can confirm that yourself with the network panel open.
Rules you are likely to hit next
A document that breaks BR-22 usually breaks one of these too, because the same mapping gap tends to affect neighbouring fields.
Questions people actually ask
- What does BR-22 mean?
- Every line carries the quantity being invoiced.
- Which field does BR-22 apply to?
- BT-129, Invoiced quantity. That is the name the semantic model uses, which is what you search for in your own system's mapping when the identifier alone does not tell you which field to look at.
- Does our validator check BR-22?
- Yes. Paste your invoice data into the free validator and it reports this rule with the value it actually saw, without the document leaving your browser.