---
id: change/bcapps/9418
type: change
title: '#9418 [ALAppExtensions #30229][Event Request] table 12113 "Tmp Withholding Contribution"'
summary: Adds an IsHandled event OnCalculateWithholdingTaxOnBeforeAssignWithholdingTaxValues to the Tmp Withholding Contribution table and extracts field assignments into a separate procedure to allow customization of withholding tax calculation logic.
tier: official
language: en
tags:
  - feature
  - main
  - bc30
  - table tmp withholding contribution
system: finance
review:
  state: reviewed
  by: opus
  at: "2026-10-08T02:12:42.914Z"
  flags: []
generated:
  at: "2026-10-08T01:26:53.141Z"
  pipeline: 0.2.0
  prompts:
    extract-change: 1
  input_hash: 950310ae8780604411959a1d13bf799fbea38be3
evidence:
  - kind: code
    url: https://github.com/microsoft/BCApps/pull/9418
    title: 'microsoft/BCApps#9418: [ALAppExtensions #30229][Event Request] table 12113 "Tmp Withholding Contribution"'
    date: "2026-07-15"
    commit: 950310ae8780604411959a1d13bf799fbea38be3
    t: null
    quote: null
links:
  learn: []
  objects:
    - object/table/12113-it
  features: []
  topics: []
  localizations: []
  videos: []
  posts: []
  guidelines: []
  changes: []
number: 9418
repo: microsoft/BCApps
source_id: bcapps-prs
url: https://github.com/microsoft/BCApps/pull/9418
kind: pr
base_branch: main
major: "30"
merged_at: "2026-07-15T08:42:27Z"
author: Explorer986
author_type: User
community_contribution: false
labels:
  - "Team: Finance"
change_class: code
change_kind: feature
behavior_change: false
breaking: false
files:
  count: 1
  additions: 23
  deletions: 7
  al: 1
apps:
  - Base Application
objects_touched:
  - key: table/12113
    page: table/12113-it
    type: table
    id: 12113
    name: Tmp Withholding Contribution
    app: Base Application
    status: modified
objects_unjoined: []
obsoletions: []
backports: []
fixes_issues: []
work_items:
  - 641342
systems:
  - finance
quote: null
joined_against:
  major: "30"
  commit: ecbc028c25dbe83b61313bc566e6c1d41184bb1c
---

# #9418 [ALAppExtensions #30229][Event Request] table 12113 "Tmp Withholding Contribution"

> Adds an IsHandled event OnCalculateWithholdingTaxOnBeforeAssignWithholdingTaxValues to the Tmp Withholding Contribution table and extracts field assignments into a separate procedure to allow customization of withholding tax calculation logic.

[Pull request](https://github.com/microsoft/BCApps/pull/9418) · merged into `main` (BC30) on 2026-07-15 by Explorer986 · 1 file (+23 -7), 1 AL · feature · tier official · reviewed (checked by Opus)

## What changed

- New IsHandled event lets extensions override withholding tax value assignments
- Standard field assignment logic extracted into AssignWithholdingTaxValues local procedure
- Negative taxable base validation remains outside the handled block to prevent bypass
- Default behavior unchanged for systems not overriding the event
- Low-risk change with backward compatibility maintained

## AL objects touched

- [Table 12113 "Tmp Withholding Contribution"](../../objects/table/12113-it.md), Base Application (IT layer): modified

## Context

- Work items: AB#641342
- Labels: Team: Finance
- Systems: finance

Source: metadata of a merged pull request in microsoft/BCApps (bcapps): title, labels, changed paths and counts, with a summary in our words. No source text and no description beyond one short quote (D10, D61).