00002: File name already used
What it means
SdI code 00002 means SdI has already received a file with exactly the same name.
The usual cause
SdI refuses a second file under a name it has seen before, even when the content is different. This happens when a corrected file keeps the name of the one that was rejected.
How to fix it
Change the progressive, the part after the underscore, so the name is new, and send the file again.
The code as published
Read the official document . Source: Elenco dei controlli effettuati sul file fattura del Sistema di Interscambio, version 2.0, published by Agenzia delle Entrate, fatturapa.gov.it, read on 8 November 2026.
Klarbon explains each code in its own words; the official wording is in the document linked above.