---
id: change/bcquality/139
type: change
title: "#139 knowledge(breaking-changes): adding a parameter to an event publisher is not a signature break"
summary: The breaking-changes knowledge article now clarifies that adding a parameter to an event publisher is not a breaking change, since event subscribers bind by parameter name, not position. This aligns the article with the existing events knowledge and removes a false positive report.
tier: official
language: en
tags:
  - fix
  - main
system: development
review:
  state: reviewed
  by: opus
  at: "2026-10-08T02:06:45.030Z"
  flags: []
generated:
  at: "2026-10-08T01:26:53.141Z"
  pipeline: 0.2.0
  prompts:
    extract-change: 1
  input_hash: 00c9307483c2ba394863b624f429bdb7feb19280
evidence:
  - kind: code
    url: https://github.com/microsoft/BCQuality/pull/139
    title: "microsoft/BCQuality#139: knowledge(breaking-changes): adding a parameter to an event publisher is not a signature break"
    date: "2026-09-02"
    commit: 00c9307483c2ba394863b624f429bdb7feb19280
    t: null
    quote: AL binds an event subscriber to its publisher by parameter name, not by position.
links:
  learn: []
  objects: []
  features: []
  topics: []
  localizations: []
  videos: []
  posts: []
  guidelines: []
  changes: []
number: 139
repo: microsoft/BCQuality
source_id: bcquality-prs
url: https://github.com/microsoft/BCQuality/pull/139
kind: pr
base_branch: main
major: null
merged_at: "2026-09-02T07:24:54Z"
author: gggdttt
author_type: User
community_contribution: false
labels: []
change_class: code
change_kind: fix
behavior_change: false
breaking: false
files:
  count: 1
  additions: 4
  deletions: 2
  al: 1
apps: []
objects_touched: []
objects_unjoined:
  - path: microsoft/knowledge/breaking-changes/do-not-change-published-procedure-signatures.md
    status: modified
    reason: not-in-snapshot
obsoletions: []
backports: []
fixes_issues: []
work_items: []
systems:
  - development
quote: AL binds an event subscriber to its publisher by parameter name, not by position.
joined_against:
  major: null
  commit: null
---

# #139 knowledge(breaking-changes): adding a parameter to an event publisher is not a signature break

> The breaking-changes knowledge article now clarifies that adding a parameter to an event publisher is not a breaking change, since event subscribers bind by parameter name, not position. This aligns the article with the existing events knowledge and removes a false positive report.

[Pull request](https://github.com/microsoft/BCQuality/pull/139) · merged into `main` on 2026-09-02 by gggdttt · 1 file (+4 -2), 1 AL · fix · tier official · reviewed (checked by Opus)

## What changed

- Event subscribers bind to publishers by parameter name, not by position
- Detection now skips event publishers whose only change is an added parameter and calls such reports false positives
- Removals, retypes, renames and var flips on event publishers are still treated as breaking
- Cross-references point to the events articles, including the cases where publisher access or adding IsHandled matters
- Added the integration-event keyword

## AL objects touched

- `microsoft/knowledge/breaking-changes/do-not-change-published-procedure-signatures.md`: modified, not in the BC? snapshot

## Context

- Systems: development
- From the description: "AL binds an event subscriber to its publisher by parameter name, not by position."

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