FW-QTY-0 warning FakturWire check
FW-QTY-0 — a line has quantity 0
What it means
A line with quantity 0 contributes nothing to the invoice total. It is usually a leftover, a placeholder, or a bug in how the line list was built. FakturWire flags it as a warning — it is valid, but almost never intended.
What triggers it
A line’s quantity is "0".
How to fix it
Remove the empty line, or set the real quantity:
{ "lines": [ { "id": "1", "name": "Consulting", "quantity": "10", "unitPrice": "120.00" } ] } If you deliberately show a zero-quantity line (e.g. a free item), you can ignore this warning — it never blocks conversion.
Check your invoice now. Paste it into the free validator — it flags FW-QTY-0 and every other EN 16931, Peppol and XRechnung rule, each with the fix.
Or run the same check via API:
curl -X POST https://fakturwire.com/v1/validate \
-H "authorization: Bearer $FW_KEY" \
-d '{"invoice": { ... }, "profile": "en16931"}'