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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: Copilot App <223556219+Copilot@users.noreply.github.com>
28 lines
1.9 KiB
Markdown
28 lines
1.9 KiB
Markdown
---
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bc-version: [all]
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domain: data-modeling
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keywords: [blocked-field, testfield, referencing-code, point-of-use, enforcement, journal-line]
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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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# Enforce `Blocked` where the master is used, not in the master itself
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## Description
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The `Blocked` field on a master record (`Item`, `Customer`, `Resource`, or a custom master) is inert data. The master table holds **no** logic that acts on it. Enforcement belongs in the **consuming** code: when a journal line, document line, or posting routine references the master by its `No.`, that referencing object tests the flag at the point of use, e.g. `LoyaltyMember.Get("Member No."); LoyaltyMember.TestField(Blocked, false);` in the line's `OnValidate` and again before posting.
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Putting the block check inside the master's own `OnInsert`/`OnModify` does nothing to stop transactional use: a blocked master is edited rarely, but it is *referenced* constantly, and those references never touch the master's own triggers. Base BC follows this split — `Item.Blocked` is checked by sales/purchase/journal code, not by the `Item` table. A boolean `Blocked` uses `TestField(Blocked, false)`; an option-style block (e.g. `Sales`/`All`) needs the specific option compared at each relevant path.
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## Best Practice
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The referencing line validates `Master.TestField(Blocked, false)` in `OnValidate` of the reference field and re-checks before posting. The master table stays logic-free on `Blocked`.
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See sample: [`check-blocked-in-referencing-code-not-in-master.good.al`](check-blocked-in-referencing-code-not-in-master.good.al).
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## Anti Pattern
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The block check sits in the master's own `OnModify`/`OnInsert` (so referencing and posting proceed unchecked), or there is no check at all on the referencing side.
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See sample: [`check-blocked-in-referencing-code-not-in-master.bad.al`](check-blocked-in-referencing-code-not-in-master.bad.al).
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