# SERIES_MONTHLY_REQUIRES_MONTH_AND_YEAR

Monthly reset requires the format to include the month ({MM}) and the year ({YYYY} or {YY}); otherwise the invoice number would repeat every month.

<Callout type="info">
**Category:** [Account settings](/errors/category/configuracion)
</Callout>

| | |
|---|---|
| HTTP status | `422` Unprocessable Content |

## Example response

When this error occurs, the API answers `422` Unprocessable Content with a JSON body of this shape:

```json
{
  "type": "https://docs.beel.es/errors/SERIES_MONTHLY_REQUIRES_MONTH_AND_YEAR",
  "title": "SERIES_MONTHLY_REQUIRES_MONTH_AND_YEAR",
  "detail": "Monthly reset requires the format to include the month ({MM}) and the year ({YYYY} or {YY}); otherwise the invoice number would repeat every month.",
  "instance": "/v1/<resource>",
  "errors": [],
  "success": false,
  "error": {
    "code": "SERIES_MONTHLY_REQUIRES_MONTH_AND_YEAR",
    "message": "Monthly reset requires the format to include the month ({MM}) and the year ({YYYY} or {YY}); otherwise the invoice number would repeat every month.",
    "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">{"Monthly reset requires the format to include the month ({MM}) and the year ({YYYY} or {YY}); otherwise the invoice number would repeat every month."}</Tab>
  <Tab value="Spanish">{"El reseteo mensual exige que el formato incluya el mes ({MM}) y el año ({YYYY} o {YY}); de lo contrario se repetiría el número de factura cada mes."}</Tab>
  <Tab value="Catalan">{"El reinici mensual exigeix que el format inclogui el mes ({MM}) i l'any ({YYYY} o {YY}); altrament es repetiria el número de factura cada mes."}</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="ACTIVE_CANNOT_DELETE" description="Cannot delete an active series. Deactivate it first" href="/errors/ACTIVE_CANNOT_DELETE" />
  <Card title="DEFAULT_CANNOT_BE_UNMARKED" description="Cannot unmark the default series. Set another series as default first" href="/errors/DEFAULT_CANNOT_BE_UNMARKED" />
  <Card title="DEFAULT_CANNOT_DEACTIVATE" description="Cannot deactivate the default series. Set another series as default first" href="/errors/DEFAULT_CANNOT_DEACTIVATE" />
  <Card title="DEFAULT_CANNOT_DELETE" description="Cannot delete the default series. Set another series as default first" href="/errors/DEFAULT_CANNOT_DELETE" />
  <Card title="ENTITY_TYPE_INCONSISTENT_WITH_NIF" description="The entity type ‹value› does not match the NIF ‹value›: an individual is identified by a DNI or NIE, and a company or entity by a NIF that starts with a legal-form letter" href="/errors/ENTITY_TYPE_INCONSISTENT_WITH_NIF" />
</div>

## Keep exploring

<div className="grid grid-cols-2 gap-3 not-prose">
  <Card title="All Account settings errors" description="Every code in this category in one table." href="/errors/category/configuracion" />
  <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