PROFORMA_ALREADY

This proforma has already been converted into an invoice; conversion cannot be repeated

Category: Invoices


HTTP status	`409` Conflict
Retry	No

When it happens

The proforma is already CONVERTED: an earlier call turned it into an invoice.

How to fix it

Do not convert it again. Look up the invoice that the earlier conversion created.

Retry

Do not retry. The outcome is final: sending the same request again gets the same answer.

Returned by

The operations where this code is most likely. The list is not exhaustive.

POST /v1/companies/{company_id}/invoices/{invoice_id}/convert-to-invoice

Example response

When this error occurs, the API answers 409 Conflict with a JSON body of this shape:

{
  "type": "https://docs.beel.es/errors/PROFORMA_ALREADY_CONVERTED",
  "title": "PROFORMA_ALREADY_CONVERTED",
  "detail": "This proforma has already been converted into an invoice; conversion cannot be repeated",
  "instance": "/v1/<resource>",
  "errors": [],
  "success": false,
  "error": {
    "code": "PROFORMA_ALREADY_CONVERTED",
    "message": "This proforma has already been converted into an invoice; conversion cannot be repeated",
    "details": {}
  },
  "meta": {
    "timestamp": "2026-05-21T10:00:00Z",
    "request_id": "4bf92f3577b34da6a3ce929d0e0e4736"
  }
}