---
id: object/codeunit/54
type: object
title: Codeunit 54 "Language Impl."
summary: Codeunit 54 "Language Impl." in System Application (System.Globalization). 27 public procedures, 1 event subscribers. Present since at least BC23, still in BC30, changed in BC24, BC26-27.
tier: official
language: en
tags:
  - codeunit
  - system application
versions:
  introduced: null
  last_changed: "27"
  deprecated: null
review:
  state: derived
  by: null
  at: null
  flags: []
generated:
  at: "2026-10-11T00:31:51.816Z"
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  input_hash: 641f42550a7bfaa77bb0321c9ea81c4bdb7b34153d22c60932b89266198c690c
evidence:
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    url: https://github.com/microsoft/BCApps/blob/ea08af5ef2d6a9b5c5af4a029288abbe2c883220/src/System%20Application/App/Language/src/LanguageImpl.Codeunit.al
    title: src/System Application/App/Language/src/LanguageImpl.Codeunit.al (releases/29.x)
    date: null
    commit: ea08af5ef2d6a9b5c5af4a029288abbe2c883220
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object_type: codeunit
object_id: 54
name: Language Impl.
namespace: System.Globalization
app: System Application
extends: null
first_version: "23"
last_version: "30"
present_in:
  - "23"
  - "24"
  - "25"
  - "26"
  - "27"
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  - "29"
  - "30"
changed_in:
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  - "26"
  - "27"
source_major: "29"
obsolete: null
countries: []
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counts:
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  procedures: 30
  events: 0
  subscribers: 1
relations:
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  referenced_by: 0
  pages: 0
  extended_by: 0
  event_subscribers: 0
  calls: 3
  called_by: 2
  implements: 0
---

# Codeunit 54 "Language Impl."

> Codeunit 54 "Language Impl." in System Application (System.Globalization). 27 public procedures, 1 event subscribers. Present since at least BC23, still in BC30, changed in BC24, BC26-27.

System Application · System.Globalization · BC23-30 · [source at ea08af5e](https://github.com/microsoft/BCApps/blob/ea08af5ef2d6a9b5c5af4a029288abbe2c883220/src/System%20Application/App/Language/src/LanguageImpl.Codeunit.al) · facts from BC29

## Properties

| Property | Value |
|---|---|
| Access | Internal |
| SingleInstance | true |
| Permissions | tabledata "Allowed Language" = rimd, tabledata Language = rimd, tabledata "Language Selection" = r, tabledata "User Personalization" = rm, tabledata "Windows Language" = r |

## Event subscriptions

- SetApplicationLanguageId subscribes to Codeunit "UI Helper Triggers" GetApplicationLanguage

## Procedures

- `GetUserLanguageCode(): Code[10]`
- `GetUserLanguageTag(): Text[80]`
- `GetLanguageIdOrDefault(LanguageCode: Code[10]): Integer`
- `GetFormatRegionOrDefault(FormatRegion: Text[80]): Text[80]`
- `SetOverrideLanguageId(LanguageId: Integer; ResetOverride: Boolean)`
- `SetOverrideFormatRegion(FormatRegion: Text[80]; ResetOverride: Boolean)`
- `GetLanguageId(LanguageCode: Code[10]): Integer`
- `GetLanguageCode(LanguageId: Integer): Code[10]`
- `GetLanguageTag(LanguageId: Integer): Text[80]`
- `GetWindowsLanguageName(LanguageCode: Code[10]): Text`
- `GetWindowsLanguageName(LanguageId: Integer): Text`
- `GetApplicationLanguages(var TempWindowsLanguage: Record "Windows Language" temporary)`
- `GetDefaultApplicationLanguageId(): Integer`
- `ToDefaultLanguage(ValueVariant: Variant): Text`
- `ValidateApplicationLanguageId(LanguageId: Integer)`
- `ValidateWindowsLanguageId(LanguageId: Integer)`
- `LookupApplicationLanguageId(var LanguageId: Integer)`
- `LookupLanguageCode(var LanguageCode: Code[10])`
- `LookupWindowsLanguageId(var LanguageId: Integer)`
- `GetParentLanguageId(LanguageId: Integer): Integer`
- `SetPreferredLanguageID(UserSecID: Guid; NewLanguageID: Integer)`
- `GetTwoLetterISOLanguageName(LanguageID: Integer): Text[2]`
- `GetLanguageIdFromCultureName(CultureName: Text): Integer`
- `GetCultureName(LanguageID: Integer): Text`
- `GetCurrentCultureName(): Text`
- `ShowAllowedLanguagesNotification()`
- `OpenReadMore(Notification: Notification)`

Plus 2 local procedures.

## Calls

From the extracted call graph of BC29 (graphify-al on the snapshot checkout): calls whose target is known from a declared type or an `Object::"Name"` argument. Interface dispatch and calls through events are not counted, so the list is not complete.

- [Codeunit 43 "Language"](../codeunit/43.md) (2 calls: `GetLanguageIdOrDefault → OnGetLanguageIdOrDefault`, `GetUserLanguageCode → OnGetUserLanguageCode`)
- [Page 535 "Windows Languages"](../page/535.md) (2 calls: `LookupApplicationLanguageId → (object)`, `LookupWindowsLanguageId → (object)`)
- [Page 9 "Languages"](../page/9.md) (1 call: `LookupLanguageCode → (object)`)

## Called by

- [Codeunit 43 "Language"](../codeunit/43.md) (21 calls: `GetApplicationLanguages → GetApplicationLanguages`, `GetCultureName → GetCultureName`, `GetCurrentCultureName → GetCurrentCultureName`, …)
- [Page 535 "Windows Languages"](../page/535.md) (1 call: `OnOpenPage → ShowAllowedLanguagesNotification`)

## Across versions

- Present in: BC23-30
- Changed (declaration) in: BC24, BC26-27

Source: AL metadata extracted from the code (names, ids, signatures, properties); no code bodies (D10).

## Ask your agent

Procedure bodies are not stored here (D10). The call sections above are our own, per object, from the BC29 call graph. For a procedure body or the calls of one procedure, ask bc-code-atlas (external, by Stefan Maron, MIT; default corpus w1-28), which the bc-observatory plugin connects: `bcatlas_resolve_node(object_type: "codeunit", object_name: "Language Impl.")`, then `bcatlas_get_procedure_body` or `bcatlas_get_neighbors` on the returned id.