Entering the same expense number twice
Factura Fácil warns when the same invoice number and the same supplier already exist. The warning is not a legal finding. You still decide whether it is a true duplicate.
What the warning compares
The match is on number and supplier. It is there so you look at the entry before you keep it twice. It does not say the tax agency has decided anything, or that the second document is false.
- Same number and same supplier.
- A warning, not a legal finding.
- You decide.
You decide if it is the same expense
It may be a second attempt to save the same invoice, or two documents that share a number because the issuer made a mistake. You open both and keep the one that fits. How expenses are reviewed is in expense tracking.
Common questions
Is the duplicate warning a ruling?
No. It warns when the number and the supplier already exist. You decide whether it is a true duplicate.
Can I keep both if they are not the same expense?
The decision is yours. The warning does not stop you reviewing the documents and keeping the entry that fits.
Official sources
Informational text reviewed on 26 September 2026. It is not tax advice and does not replace the Spanish Tax Agency or your accountant. Deadlines, rates, and forms can change.