---
title: "En16931Rules – API-Referenz · Quittio"
description: "EN 16931 business rules (BR-…) and conditions (BR-CO-…) checked on the data model."
canonical_url: "https://quittio.dev/docs/api/Quittio/Core/Validation/Rules/En16931Rules"
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  "twitter:image:alt": "Quittio: E-Rechnungen für PHP und Laravel. Rechtssicher, validiert, archiviert, mit geprüfter Beispielrechnung."
---

> Index of every page on this site: [llms.txt](https://quittio.dev/llms.txt)

[API reference](https://quittio.dev/docs/api) / [Quittio](https://quittio.dev/docs/api/Quittio) \\ [Core](https://quittio.dev/docs/api/Quittio/Core) \\ [Validation](https://quittio.dev/docs/api/Quittio/Core/Validation) \\ [Rules](https://quittio.dev/docs/api/Quittio/Core/Validation/Rules)

# En16931Rules

final class in quittio/core

`Quittio\Core\Validation\Rules\En16931Rules` · [Source](https://github.com/Quittio/quittio/blob/v0.7.1/packages/core/src/Validation/Rules/En16931Rules.php#L23)

EN 16931 business rules (BR-…) and conditions (BR-CO-…) checked on the data model.

These rules cover the most frequent Schematron findings with readable messages. They do not replace the official Schematron validation (level L5).

## Methods \#

| Method | Description |
| --- | --- |
| `::all()` | |

### `all()`#

```
public static function all(): list<Rule>
```

static

<dl><dt>Returns</dt>
<dd><code>list&lt;<a href="https://quittio.dev/docs/api/Quittio/Core/Validation/Rule">Rule</a>&gt;</code></dd>
</dl>

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```