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knowledge(performance): add community rules for JIT, locks, and false positives

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These articles capture BC-specific mechanics agents still invert: partial-record JIT on writes, Reset clearing SetLoadFields, HttpClient inside write transactions, and batched number series, plus negative guidance that stops over-eager Query and IsEmpty "fixes".

Co-authored-by: Cursor <cursoragent@cursor.com>
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Stefano Demiliani 2026-08-20 15:57:58 +02:00
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---
bc-version: [all]
domain: performance
keywords: [guiallowed, clienttype, odata, edit-in-excel, page-trigger, factbox]
technologies: [al]
countries: [w1]
application-area: [all]
---
# Guard page trigger work with GuiAllowed for OData and Excel
> Contributions welcome — open a PR to refine or extend this article.
## Description
Pages exposed as OData, including Edit in Excel, still run AL page triggers for every row returned. FactBox updates, defaulting, and extra `CalcFields` in `OnAfterGetRecord` therefore run on the web-service path where no UI exists. `GuiAllowed` is false for those sessions. Agents add page logic as if only the browser client will execute it.
## Best Practice
Wrap UI-only work — FactBox refresh, notifications, defaulting that is not part of the web-service contract — in `if GuiAllowed then`. Keep the OData path to field values the API actually returns.
See sample: `guiallowed-guard-on-pages-used-as-odata.good.al`.
## Anti Pattern
Unconditional FactBox or calculation logic in `OnAfterGetRecord` / `OnAfterGetCurrRecord` on a page that is published as a web service or used with Edit in Excel. The signal is trigger work that calls `CurrPage` parts or extra queries without a `GuiAllowed` guard.
See sample: `guiallowed-guard-on-pages-used-as-odata.bad.al`.