FW-DUE warning FakturWire check

FW-DUE — due date is before the issue date

What it means

The payment due date falls before the invoice issue date — which would mean the invoice was due before it existed. Almost always a swapped or mistyped date.

What triggers it

dueDate is earlier than issueDate.

How to fix it

Set a due date on or after the issue date:

{ "issueDate": "2026-07-01", "dueDate": "2026-07-31" }

Dates are ISO YYYY-MM-DD. If you use payment terms in days, add them to the issue date.

Check your invoice now. Paste it into the free validator — it flags FW-DUE 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"}'

Related rules

← All EN 16931 / Peppol / XRechnung rules