---
title: "NoteSubjectCode – API-Referenz · Quittio"
description: "Invoice note subject code (BT-21), UNTDID 4451 subset. Further codes can be used as RawCode."
canonical_url: "https://quittio.dev/docs/api/Quittio/Core/Enums/NoteSubjectCode"
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meta:
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  "og:image": "https://quittio.dev/og/quittio-de.jpg"
  "og:image:alt": "Quittio: E-Rechnungen für PHP und Laravel. Rechtssicher, validiert, archiviert, mit geprüfter Beispielrechnung."
  "og:image:height": "630"
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  "og:title": "NoteSubjectCode – API-Referenz · Quittio"
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---

> 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) \\ [Enums](https://quittio.dev/docs/api/Quittio/Core/Enums)

# NoteSubjectCode

string-backed enum in quittio/core · uses [`HasLabel`](https://quittio.dev/docs/api/Quittio/Core/Enums/Concerns/HasLabel)

`Quittio\Core\Enums\NoteSubjectCode` · [Source](https://github.com/Quittio/quittio/blob/v0.7.1/packages/core/src/Enums/NoteSubjectCode.php#L13)

Invoice note subject code (BT-21), UNTDID 4451 subset. Further codes can be used as RawCode.

## Cases \#

| Case | Value | Description |
| --- | --- | --- |
| `GeneralInformation` | `'AAI'` | |
| `PriceConditions` | `'AAK'` | |
| `LegalInformation` | `'ABL'` | |
| `Introduction` | `'ACY'` | |
| `PaymentDetail` | `'PMD'` | |
| `PaymentInformation` | `'PMT'` | |
| `RegulatoryInformation` | `'REG'` | |
| `SupplierRemarks` | `'SUR'` | |
| `TaxDeclaration` | `'TXD'` | |

## Methods \#

| Method | Description |
| --- | --- |
| `::isValidCode()` | Whether a raw code value is valid according to the official code list. |
| `->label()` | |
| `::labelGroup()` | |

### `isValidCode()`#

```
public static function isValidCode(string $code): bool
```

static

Whether a raw code value is valid according to the official code list.

| Parameter | Type | Description |
| --- | --- | --- |
| `$code` | `string` | |

<dl><dt>Returns</dt>
<dd><code>bool</code></dd>
</dl>

### `label()`#

```
public function label(?string $locale = null): string
```

| Parameter | Type | Description |
| --- | --- | --- |
| `$locale` | `?string` = `null` | |

<dl><dt>Returns</dt>
<dd><code>string</code></dd>
</dl>

### `labelGroup()`#

```
public static function labelGroup(): string
```

static

<dl><dt>Returns</dt>
<dd><code>string</code></dd>
</dl>

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```