| 99 | Unknown error | An unexpected system error occurred. |
| 01 | Interface coding error | The specified interface code is invalid or unsupported. |
| 02 | White box encryption failed | Internal EFRIS encryption failed. |
| 03 | White box decryption failed | Internal EFRIS decryption failed. |
| 04 | Read white box error | EFRIS could not access its encryption components. |
| 05 | AppID error | Invalid application identifier. |
| 06 | The outer message is empty | No request payload was supplied. |
| 07 | GlobalInfo content cannot be empty | Required request metadata is missing. |
| 08 | Data content cannot be empty | Request data is missing. |
| 09 | ReturnStateInfo content cannot be empty | Required return state information is missing. |
| 10 | DataDescription content cannot be empty | Data description information is missing. |
| 11 | InterfaceCode cannot be empty | Interface code is required. |
| 12 | UserName cannot be empty | Username is required. |
| 13 | TaxpayerID cannot be empty | Taxpayer ID is required. |
| 14 | DeviceMAC cannot be empty | Device MAC address is required. |
| 15 | Unpacking data error | The request payload could not be processed. |
| 16 | AppID cannot be empty | Application identifier is required. |
| 17 | Version cannot be empty | Client version is required. |
| 18 | DataExchangeId cannot be empty | Data exchange identifier is required. |
| 19 | RequestCode cannot be empty | Request code is required. |
| 20 | RequestTime cannot be empty | Request timestamp is required. |
| 21 | ResponseCode cannot be empty | Response code is required. |
| 22 | Currency cannot be empty | Currency is required. |
| 23 | Tax rate acquisition error | EFRIS could not retrieve tax rate information. |
| 24 | The version cannot be longer than 15 characters | Version exceeds the allowed length. |
| 25 | DataExchangeId cannot be greater than 32 characters | Data exchange identifier exceeds the allowed length. |
| 26 | RequestCode error | Invalid request code supplied. |
| 27 | ResponseCode error | Invalid response code supplied. |
| 28 | The difference between RequestTime and the current time is greater than ten minutes | Request timestamp falls outside the allowed time window. |
| 29 | DeviceMAC cannot be greater than 25 characters | Device MAC address exceeds the allowed length. |
| 30 | AppID error | Invalid application identifier. |
| 31 | RequestTime time format error | Request timestamp format is invalid. |
| 32 | Version is too low, please upgrade version | Client version is no longer supported. |
| 33 | Version error | Invalid version supplied. |
| 34 | Longitude cannot be empty | Longitude is required. |
| 35 | Longitude cannot be greater than 60 characters | Longitude exceeds the allowed length. |
| 36 | Latitude cannot be empty | Latitude is required. |
| 37 | Latitude cannot be greater than 60 characters | Latitude exceeds the allowed length. |
| 38 | Signature value is invalid | Request signature validation failed. |
| 39 | Signature value cannot be empty | Request signature is missing. |
| 40 | Insufficient permissions | The authenticated user does not have permission to perform the requested operation. |
| 41 | Item does not exist | The specified item could not be found. |
| 42 | Please register for e-Invoicing first | The taxpayer is not enrolled for EFRIS e-Invoicing. |
| 43 | Outer packet json format is invalid | Request JSON structure is invalid. |
| 44 | Taxpayer branch has been removed | The referenced branch is no longer active. |
| 45 | Partial failure | Some operations completed successfully while others failed. |
| 46 | Database error | An internal database error occurred. |