EXEMPTION_INCOMPATIBLE_WITH_REGIME

When it happens

A line combines an exemption_reason with a regime_key that cannot go with it. Exports (EXENTA_ART_21 and EXENTA_ART_22), for example, use regime 02.

How to fix it

Use the regime key the exemption requires, or omit regime_key so the server picks it.

Retry

Not as is: the same request fails the same way. Fix the cause described above, then send the request again, under a new Idempotency-Key if the body changed.

Returned by

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

• POST /v1/companies/{company_id}/invoices
• PATCH /v1/companies/{company_id}/invoices/{invoice_id}

Rules that cite this code

• REC-013 An invoice AEAT would reject is not numbered

Example response

When this error occurs, the API answers 400 Bad Request with a JSON body of this shape:

{
  "type": "https://docs.beel.es/errors/EXEMPTION_INCOMPATIBLE_WITH_REGIME",
  "title": "EXEMPTION_INCOMPATIBLE_WITH_REGIME",
  "detail": "Exemption reason ‹reason› does not allow regime ‹regime›; exports (art. 21 and 22 LIVA) use regime 02",
  "instance": "/v1/<resource>",
  "errors": [],
  "success": false,
  "error": {
    "code": "EXEMPTION_INCOMPATIBLE_WITH_REGIME",
    "message": "Exemption reason ‹reason› does not allow regime ‹regime›; exports (art. 21 and 22 LIVA) use regime 02",
    "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.

Placeholders are filled in at runtime:

• ‹reason› — the line's exemption_reason.
• ‹regime› — the regime_key it was combined with.

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