SIMPLIFICADA_FORBIDS_ISP

When it happens

A line of a SIMPLIFIED invoice uses a reverse-charge exemption_reason (ISP_*). Under reverse charge the recipient pays the VAT, so the recipient has to be identified.

How to fix it

Issue a STANDARD invoice with the recipient identified.

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

Rules that cite this code

• SIM-003 Some operations can never go on a simplified invoice
• TAX-003 Reverse-charge lines carry no tax and never go on a simplified invoice

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/SIMPLIFICADA_FORBIDS_ISP",
  "title": "SIMPLIFICADA_FORBIDS_ISP",
  "detail": "Simplified invoices and their correctives (R5) cannot carry reverse-charge: the anonymous recipient cannot auto-liquidate",
  "instance": "/v1/<resource>",
  "errors": [],
  "success": false,
  "error": {
    "code": "SIMPLIFICADA_FORBIDS_ISP",
    "message": "Simplified invoices and their correctives (R5) cannot carry reverse-charge: the anonymous recipient cannot auto-liquidate",
    "details": {}
  },
  "meta": {
    "timestamp": "2026-05-21T10:00:00Z",
    "request_id": "4bf92f3577b34da6a3ce929d0e0e4736"
  }
}

The type URI is stable and always resolves to this page.

Message

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