CONVERSION_REQUIRES_PROFORMA
Only a proforma invoice can be converted into an invoice; this document is not a proforma
Category: Invoices
| HTTP status | 422 Unprocessable Content |
Example response
When this error occurs, the API answers 422 Unprocessable Content with a JSON body of this shape:
{
"type": "https://docs.beel.es/errors/CONVERSION_REQUIRES_PROFORMA",
"title": "CONVERSION_REQUIRES_PROFORMA",
"detail": "Only a proforma invoice can be converted into an invoice; this document is not a proforma",
"instance": "/v1/<resource>",
"errors": [],
"success": false,
"error": {
"code": "CONVERSION_REQUIRES_PROFORMA",
"message": "Only a proforma invoice can be converted into an invoice; this document is not a proforma",
"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.
Other errors in this category
ATTACH_SOURCE_INVOICE_UNAVAILABLE
A source invoice is not available (it does not exist or you no longer have access); uncheck the source invoices attachment to send without the folder
ATTACH_SOURCE_INVOICES_NO_SOURCES
The invoice has no consolidation disbursements: there are no source invoices to attach
ATTACH_SOURCE_INVOICES_REQUIRES_PDF
Attaching the source invoices also requires attaching the invoice PDF
ATTACH_SOURCE_PDF_MISSING
These source invoices have no generated PDF: ‹value›
ATTACH_SOURCE_ZIP_TOO_LARGE
The source invoices ZIP (‹value› MB) exceeds the maximum sendable size (‹value› MB)
Keep exploring
CONNECTION_SERIE_TIPO_INCOMPATIBLE
The series document type (‹value›) is not compatible with this field (‹value›)
CORRECTIVE_BAD_DEBT_BASE_TOO_LOW
A bad-debt corrective (R3) is not possible for an operation with a base of €‹value› to a consumer: the base must exceed €50. If the recipient acted as a business or professional, say so with recipient_is_business.