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Lead with a complete plugin quick start and add task-oriented usage, troubleshooting, customization, and contribution guides. Preserve the broader plugin framing, correct conflicting contract guidance, support Agents folder reviews, and align repository validation. Convert existing sample references to clickable links without changing knowledge rules. Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com> Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
26 lines
1.6 KiB
Markdown
26 lines
1.6 KiB
Markdown
---
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bc-version: [all]
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domain: events
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keywords: [event-parameters, signature, backward-compatibility, public-event, local-event, internal-event, appsourcecop, as0024, as0025]
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technologies: [al]
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countries: [w1]
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application-area: [all]
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---
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# Event parameter additions depend on publisher access, not position
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## Description
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Event subscribers bind publisher parameters by name and can omit parameters they do not use. A `local` or `internal` Business or Integration event can therefore gain a parameter at any position without breaking subscriber-only consumers; appending is not a compatibility requirement. A public event is also a public procedure that dependent extensions can raise, so adding a required parameter anywhere breaks callers under AppSourceCop AS0024.
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## Best Practice
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Add a parameter directly only when the shipped event publisher is `local` or `internal`. Place it where the signature is clearest; existing subscribers continue binding the parameters they name. For a public event, keep the original publisher unchanged and introduce a new event with the expanded contract.
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See sample: [`add-new-event-parameters-at-the-end.good.al`](add-new-event-parameters-at-the-end.good.al).
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## Anti Pattern
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Appending a parameter to a public event and assuming its position makes the change compatible. Existing external callers still lack the new required argument. Conversely, do not flag a parameter inserted among existing parameters on a `local` or `internal` Business or Integration event merely because it was not appended.
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See sample: [`add-new-event-parameters-at-the-end.bad.al`](add-new-event-parameters-at-the-end.bad.al).
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