# OSS_REGIME_INCOMPATIBLE_WITH_ISP

OSS/IOSS regime (key 17) is incompatible with reverse charge. The destination-country VAT is declared separately (Modelo 369), not as S2

<Callout type="info">
**Category:** [Invoices](/errors/category/invoicing)
</Callout>

## Rules that cite this code

- [TAX-003 · Reverse-charge lines carry no tax and never go on a simplified invoice](/rules/taxes#tax-003)
- [TAX-007 · Sales declared through OSS use regime key 17](/rules/taxes#tax-007)

## Example response

When this error occurs, the API returns a JSON response with the following shape:

```json
{
  "type": "https://docs.beel.es/errors/OSS_REGIME_INCOMPATIBLE_WITH_ISP",
  "title": "OSS_REGIME_INCOMPATIBLE_WITH_ISP",
  "detail": "OSS/IOSS regime (key 17) is incompatible with reverse charge. The destination-country VAT is declared separately (Modelo 369), not as S2",
  "instance": "/v1/<resource>",
  "errors": [],
  "success": false,
  "error": {
    "code": "OSS_REGIME_INCOMPATIBLE_WITH_ISP",
    "message": "OSS/IOSS regime (key 17) is incompatible with reverse charge. The destination-country VAT is declared separately (Modelo 369), not as S2",
    "details": {}
  },
  "meta": {
    "timestamp": "2026-05-21T10:00:00Z",
    "request_id": "4bf92f3577b34da6a3ce929d0e0e4736"
  }
}
```

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

## Message

<Tabs items={["English", "Spanish", "Catalan"]}>
  <Tab value="English">{"OSS/IOSS regime (key 17) is incompatible with reverse charge. The destination-country VAT is declared separately (Modelo 369), not as S2"}</Tab>
  <Tab value="Spanish">{"El régimen OSS/IOSS (clave 17) es incompatible con inversión del sujeto pasivo. El IVA del país destino se declara aparte (Modelo 369), no como S2"}</Tab>
  <Tab value="Catalan">{"El règim OSS/IOSS (clau 17) és incompatible amb inversió del subjecte passiu. L'IVA del país de destinació es declara apart (Model 369), no com a S2"}</Tab>
</Tabs>

Send the request with `Accept-Language: <es|en|ca>` to receive the message in your preferred language.

## Other errors in this category

<div className="grid grid-cols-2 gap-3 not-prose">
  <Card title="ATTACH_SOURCE_INVOICE_UNAVAILABLE" description="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" href="/errors/ATTACH_SOURCE_INVOICE_UNAVAILABLE" />
  <Card title="ATTACH_SOURCE_INVOICES_NO_SOURCES" description="The invoice has no consolidation disbursements: there are no source invoices to attach" href="/errors/ATTACH_SOURCE_INVOICES_NO_SOURCES" />
  <Card title="ATTACH_SOURCE_INVOICES_REQUIRES_PDF" description="Attaching the source invoices also requires attaching the invoice PDF" href="/errors/ATTACH_SOURCE_INVOICES_REQUIRES_PDF" />
  <Card title="ATTACH_SOURCE_PDF_MISSING" description="These source invoices have no generated PDF: ‹value›" href="/errors/ATTACH_SOURCE_PDF_MISSING" />
  <Card title="ATTACH_SOURCE_ZIP_TOO_LARGE" description="The source invoices ZIP (‹value› MB) exceeds the maximum sendable size (‹value› MB)" href="/errors/ATTACH_SOURCE_ZIP_TOO_LARGE" />
</div>

## Keep exploring

<div className="grid grid-cols-2 gap-3 not-prose">
  <Card title="All Invoices errors" description="Every code in this category in one table." href="/errors/category/invoicing" />
  <Card title="Error reference home" description="Browse every category or jump to the handling guide." href="/errors" />
</div>

---

Full OpenAPI spec: https://docs.beel.es/api/openapi