---
id: object/codeunit/42
type: object
title: Codeunit 42 "Caption Class"
summary: Codeunit 42 "Caption Class" in System Application (System.Text). 2 events. Present since at least BC23, still in BC30.
tier: official
language: en
tags:
  - codeunit
  - system application
versions:
  introduced: null
  last_changed: null
  deprecated: null
review:
  state: derived
  by: null
  at: null
  flags: []
generated:
  at: "2026-10-11T00:31:51.816Z"
  pipeline: 0.2.0
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  input_hash: 1dd219b00de8f1ba220bc6ade664fee1c429479c61afa557574432a5db2e7957
evidence:
  - kind: code
    url: https://github.com/microsoft/BCApps/blob/ea08af5ef2d6a9b5c5af4a029288abbe2c883220/src/System%20Application/App/Caption%20Class/src/CaptionClass.Codeunit.al
    title: src/System Application/App/Caption Class/src/CaptionClass.Codeunit.al (releases/29.x)
    date: null
    commit: ea08af5ef2d6a9b5c5af4a029288abbe2c883220
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object_type: codeunit
object_id: 42
name: Caption Class
namespace: System.Text
app: System Application
extends: null
first_version: "23"
last_version: "30"
present_in:
  - "23"
  - "24"
  - "25"
  - "26"
  - "27"
  - "28"
  - "29"
  - "30"
changed_in: []
source_major: "29"
obsolete: null
countries: []
ms_search_form_ids: []
counts:
  fields: 0
  procedures: 2
  events: 2
  subscribers: 0
relations:
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  referenced_by: 0
  pages: 0
  extended_by: 0
  event_subscribers: 6
  calls: 0
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---

# Codeunit 42 "Caption Class"

> Codeunit 42 "Caption Class" in System Application (System.Text). 2 events. Present since at least BC23, still in BC30.

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

## Properties

| Property | Value |
|---|---|
| Access | Public |
| SingleInstance | true |

## Events published

- `OnResolveCaptionClass(CaptionArea: Text; CaptionExpr: Text; Language: Integer; var Caption: Text; var Resolved: Boolean)` (integration): Integration event for resolving CaptionClass expression, split into CaptionArea and CaptionExpr. Note there should be a single subscriber per caption area. The event implements the "resolved" pattern - if a subscriber resolves the caption, it should set Resolved to TRUE.
  - subscribers: [Codeunit 341 "VAT CaptionClass Mgmt"](../codeunit/341.md) ResolveCaptionClass, [Codeunit 342 "Currency CaptionClass Mgmt"](../codeunit/342.md) ResolveCaptionClass, [Codeunit 343 "Dimension CaptionClass Mgmt"](../codeunit/343.md) ResolveCaptionClass, [Codeunit 344 "County CaptionClass Mgmt"](../codeunit/344.md) ResolveCaptionClass, [Codeunit 6278 "Sust. CaptionClass Mgt"](../codeunit/6278.md) ResolveCaptionClass, [Codeunit 6512 "Item Tracking CaptionClass Mgt"](../codeunit/6512.md) ResolveCaptionClass
- `OnAfterCaptionClassResolve(Language: Integer; CaptionExpression: Text; var Caption: Text[1024])` (integration): Integration event for after resolving CaptionClass expression.

## Called by

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 55 "Caption Class Impl."](../codeunit/55.md) (2 calls: `DoResolveCaptionClass → OnAfterCaptionClassResolve`, `ResolveCaptionClass → OnResolveCaptionClass`)

## Across versions

- Present in: BC23-30
- Changed (declaration) in: none

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: "Caption Class")`, then `bcatlas_get_procedure_body` or `bcatlas_get_neighbors` on the returned id.