| Code | Error code | Response/error message |
| 200 | - | (successful request) |
| 200 | WRONG_FORMAT | (required fields are missing or have a wrong format) |
| 200 | NO_OBJECT_FOUND | “no object with the given fiscal id found” |
| 200 | NO_CERT_FOUND | “certificate not found” |
| 200 | WRONG_DATE_TIME | "incorrect date and time of operation" |
| 200 | WRONG_DATE_TIME_FOR_LAST_INV | "the date and time is less than the last invoice time" |
| 200 | MISSING_PARENT_FISCAL_NUM | "missing ‘parentFiscalNum’ field" |
| 200 | WRONG_TOTAL_NET_AMOUNT | "total net amount does not match the sum of all item amounts" |
| 200 | WRONG_AMOUNT_DUE | "amount due does not equal total amount minuse the sum of all payments" |
| 200 | WRONG_VAT_TOTAL_AC | "vatTotalAC does not equal to sum of taxTotal tax amounts" |
| 200 | NO_PAYMENT_DUE_DETAILS | "amount due is positive, but neither a payment due dat nor payment terms are provided" |
| 200 | OTHER | Other errors |