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Author 7 remedial BCQuality knowledge articles plus good/bad AL samples (21 files) covering AL master-table and data-model design: - data-modeling: master No. from number series in OnInsert; use codeunit "No. Series" not obsolete NoSeriesManagement; setup table is a singleton; set Last Date Modified in OnModify and OnRename; enforce Blocked in referencing code not in the master. - style: ApplicationArea required on page controls (AS0062). - appsource: object affixes prevent collisions (AS0011). Clean-room authored from own BC knowledge; specifics verified against public sources only (learn.microsoft.com, microsoft/BCApps). Introduces two new domains (data-modeling, appsource). Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com> Co-authored-by: Copilot <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: appsource
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keywords: [object-affix, prefix, suffix, as0011, appsourcecop, collision, tableextension]
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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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# Apply a reserved affix to objects and to members added to base objects
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## Description
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An AppSource extension must carry a reserved affix — a prefix or a suffix of at least three characters — on the names of the objects it owns **and** on any field, key, control, or action it adds to a base-application object. The affix is registered with Microsoft; when two coexisting extensions would otherwise collide, the registrant of the affix wins. Without it, two apps that both add a `Loyalty Points` field to `Customer`, or both define a `Loyalty Tier` table, cannot be installed side by side.
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AppSourceCop enforces this. The primary rule is AS0011 ("An affix is required"); the affixes are configured through `mandatoryAffixes` (and `mandatoryPrefix`) in `AppSourceCop.json`. Two placements matter and are easy to get half-right: an object you define carries the affix at **object-name** level, while a member you add to a **standard** object carries the affix on that **member's** name. Adding an affixed object is not enough — an unaffixed field bolted onto `Customer` still collides and still fails validation.
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## Best Practice
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Own objects are named with the affix (e.g. a table `ABC Loyalty Tier`), and every field or action added to a standard object is individually affixed (e.g. `Loyalty Points ABC` on a `Customer` tableextension).
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See sample: `object-affixes-prevent-collisions.good.al`.
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## Anti Pattern
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Unaffixed object or member names, or the common half-measure: the extension object carries the affix but a field it adds to a standard table does not. AS0011 flags the missing affix and the field can still collide with another app.
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See sample: `object-affixes-prevent-collisions.bad.al`.
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