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- Resolve conflicts in al-data-modeling-review.md by keeping both sides' additions (folder-path support, InitRecord/Round cues from upstream; the 9 document-distribution/pricing/barcode cues from this branch). - Switch the data-modeling evaluation override from an ad-hoc additionalArticles field to upstream's now-established articles[] convention (used elsewhere for finance/scm/query/reporting/style), removing the redundant parallel code path from Test-ReviewFixtures.ps1. - Fix all 9 new articles' sample references to the markdown-link READ convention required by Knowledge-Retrieval.ps1's Assert-SampleLink (plain backticks satisfy validate_frontmatter.py's regex alone but not this stricter check - both validators must pass). Validators: frontmatter 0/0, review-fixtures 126 cases/20 domains PASSED, knowledge-index 342 articles/575 samples PASSED, skill-index 19 review leaves PASSED. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
74 lines
3.7 KiB
Markdown
74 lines
3.7 KiB
Markdown
---
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bc-version: [all]
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domain: data-modeling
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keywords: [price-calculation, price-source, onafteraddsources, recalculation, pricing]
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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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# A new price source needs both a calculation candidate and a recalculation trigger
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## Description
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Making a custom field usable as a price source on a sales line is two
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separate, independent pieces of wiring, and doing only one produces a
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line that looks like it's using the new source without ever actually
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being priced by it. `codeunit "Sales Line - Price"` publishes
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`OnAfterAddSources(SalesHeader: Record "Sales Header"; SalesLine: Record
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"Sales Line"; PriceType: Enum "Price Type"; var PriceSourceList: Codeunit
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"Price Source List")` — subscribing here and calling
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`PriceSourceList.Add(SourceType, SourceNo)` makes the source a candidate
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the calculation considers. But nothing about that subscription causes
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the price to be *recalculated* when the source field's value changes on
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an existing line. That's the second, separate piece: `Sales Line`'s own
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`procedure UpdateUnitPriceByField(CalledByFieldNo: Integer)` must be
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called from the source field's own trigger — the same way Microsoft's
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own Location example is wired from a `Sales Line` validation event, not
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from the price source registration itself.
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Add the source without wiring recalculation, and the failure hides
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easily: a *new* line still prices correctly, because the field already
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holds its value when calculation first runs on insert. The gap only
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shows up when someone *changes* the source field's value on an existing
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line — the price silently keeps its old value until something unrelated
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happens to trigger recalculation.
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## Best Practice
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Wire both halves together whenever a field becomes a price source: an
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`OnAfterAddSources` subscriber that adds it via `PriceSourceList.Add`, and
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a trigger on the field itself (its own `OnValidate`, or a matching
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`OnAfterValidate` integration event) that calls
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`SalesLine.UpdateUnitPriceByField(SalesLine.FieldNo(<TheField>))`.
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See sample: [`new-price-source-must-add-candidate-and-trigger-recalculation.good.al`](new-price-source-must-add-candidate-and-trigger-recalculation.good.al).
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## Anti Pattern
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Subscribing to `OnAfterAddSources` to register a custom field as a price
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source, without also triggering recalculation from that field's own
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validation. The field is a genuine, working calculation candidate — new
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lines price correctly — but editing the field on an existing line leaves
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the unit price stale, with nothing to indicate why.
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See sample: [`new-price-source-must-add-candidate-and-trigger-recalculation.bad.al`](new-price-source-must-add-candidate-and-trigger-recalculation.bad.al).
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## Source
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BCApps (`src/Layers/W1/BaseApp/`): `Sales/Pricing/SalesLinePrice.Codeunit.al`
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(`local procedure OnAfterAddSources(SalesHeader: Record "Sales Header";
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SalesLine: Record "Sales Line"; PriceType: Enum "Price Type"; var
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PriceSourceList: Codeunit "Price Source List")`); `Pricing/Source/PriceSourceList.Codeunit.al`
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(`procedure Add(SourceType: Enum "Price Source Type"; SourceNo: Code[20])`);
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`Sales/Document/SalesLine.Table.al` (`procedure
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UpdateUnitPriceByField(CalledByFieldNo: Integer)`).
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Microsoft Learn, "Extending Price Calculations" (Location example): "To
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recalculate the price, we can subscribe to events that pass the sales
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line by reference... We'll call the UpdateUnitPriceByLocationCode()
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method, which is a simplified version of the UpdateUnitPriceByField()
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method... To add the location in the source list for price calculations,
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we'll subscribe to the OnAfterAddSources event of Codeunit 'Sales Line -
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Price,' and add the Location Code as a source."
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(https://learn.microsoft.com/dynamics365/business-central/dev-itpro/developer/devenv-extending-best-price-calculations)
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