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* Add P0 extensibility compatibility knowledge Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 645349fd-1892-48f3-8a84-db77d6abd1c3 * Correct event compatibility guidance Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 645349fd-1892-48f3-8a84-db77d6abd1c3 --------- Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.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-attribute, includesender, globalvaraccess, isolated-event, compatibility, integration-event, business-event, appsourcecop, as0021, as0101]
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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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# Do not change shipped event attribute flags
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## Description
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`IncludeSender` and, on Integration events, `GlobalVarAccess` have been event-contract flags since runtime 1.0. Removing sender or global access breaks subscribers, so AppSourceCop AS0021 prevents changing those flags from `true` to `false`. On runtime 9.0 and later (Business Central 2022 release wave 1, BC20), `Isolated` also controls transaction, error, and rollback behavior; AS0101 prevents adding, removing, or changing that argument.
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## Best Practice
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Keep every available attribute argument exactly as shipped. If new subscribers need different sender/global exposure, publish a new event with the desired flags. Apply the same rule to `Isolated` only on BC20 or later, where that argument exists. Raise both events while the original contract is supported, and choose preferred flags only when designing a new event.
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See sample: `do-not-change-shipped-event-attribute-flags.good.al`.
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## Anti Pattern
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Changing a shipped event's `IncludeSender` or `GlobalVarAccess` to modernize its design, including replacing `IncludeSender` with an explicit parameter. On BC20 or later, adding, removing, or toggling `Isolated` is equally contract-significant. Even a change that leaves old subscribers compiling can alter observable execution or exposure; version the event instead.
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See sample: `do-not-change-shipped-event-attribute-flags.bad.al`.
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