SERIES_CODE_DUPLICATED
The code ''{0}'' is already taken by a series, existing or deleted. Series codes are never reused: they identify invoices already issued. Choose a different code.
Category: Account settings
Example response
When this error occurs, the API returns a JSON response with the following shape:
{
"type": "https://docs.beel.es/errors/SERIES_CODE_DUPLICATED",
"title": "SERIES_CODE_DUPLICATED",
"detail": "The code ''{0}'' is already taken by a series, existing or deleted. Series codes are never reused: they identify invoices already issued. Choose a different code.",
"instance": "/v1/<resource>",
"errors": [],
"success": false,
"error": {
"code": "SERIES_CODE_DUPLICATED",
"message": "The code ''{0}'' is already taken by a series, existing or deleted. Series codes are never reused: they identify invoices already issued. Choose a different code.",
"details": {}
},
"meta": {
"timestamp": "2026-05-21T10:00:00Z",
"request_id": "4bf92f3577b34da6a3ce929d0e0e4736"
}
}The type URI is stable and always resolves to this page.
Message
Send the request with Accept-Language: <es|en|ca> to receive the message in your preferred language.
Tokens like
{0}are runtime arguments — the backend fills them with actual values before responding.
Other errors in this category
ACTIVE_CANNOT_DELETE
Cannot delete an active series. Deactivate it first
DEFAULT_CANNOT_BE_UNMARKED
Cannot unmark the default series. Set another series as default first
DEFAULT_CANNOT_DEACTIVATE
Cannot deactivate the default series. Set another series as default first
DEFAULT_CANNOT_DELETE
Cannot delete the default series. Set another series as default first
FISCAL_IDENTITY_LIVE_ONLY
This company is live. In Test mode you can only change how the invoice looks (logo, colour, template and languages). Fiscal details are edited in Live mode