bcquality/microsoft/knowledge/finance/normal-vat-journal-amount-includes-vat.md
Jesper Schulz-Wedde 07e324ddbc
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Add source-verified Finance knowledge and review domain (#57)
* Add Finance posting domain-knowledge pilot

Adds three atomic domain-rule knowledge files under community/knowledge/finance/ as a pilot for Type-A (normative) Business Central domain knowledge: post through the posting engine, treat posted ledger entries as immutable, and treat the Dimension Set ID as the source of truth for dimensions. Includes a good/bad AL sample pair for the posting rule.

These encode BC-specific invariants that LLMs reliably get wrong, fitting the existing remedial/atomic knowledge grain with no schema or contract changes. Passes the repo frontmatter validator and is discovered by the knowledge index.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Clarify editable operational fields on posted ledger entries

Addresses review feedback from @JeremyVyska on PR #57: the immutability rule applies to financial content, not the whole entry. Reframes the Description around financial content and gives the operational-field exception (payment/application data, on-hold, applies-to, communication fields edited via CustEntry-Edit/VendEntry-Edit and the ledger entry pages) its own paragraph in Best Practice instead of understating it as a narrow set.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Expand Finance pilot into a source-verified review domain

Move Finance knowledge to the Microsoft-owned layer, add nine scoped rules with eighteen AL samples, and register bounded Finance review with complete paired evaluation coverage.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Fix Finance review applicability and ownership boundaries

Remove application-area gating and later VAT-field dependencies, align dynamic shared conventions, separate SCM ownership, and keep journal examples focused on the intended invariant.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Remove logo branding (#194)

Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Add title and description to README

* Add foundational AL developer knowledge (#195)

Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Clarify locale-safe DateFormula Evaluate inputs (#193)

* Clarify locale-safe DateFormula Evaluate inputs

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Normalize DateFormula article sections

Keep the analyzer-gap explanation in Description and its scoped probe evidence in References, without a novel Validation section. Normative guidance and fixtures are unchanged.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Add SCM functional knowledge domain (#192)

* Add SCM functional knowledge domain

Introduce nine source-backed rules with original AL sample pairs, bounded SCM review routing, and complete positive/clean evaluation coverage.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Normalize SCM knowledge and review ownership

Align article and AL sample conventions, keep BC facts separate from review mechanics, and clarify reciprocal Finance ownership without bespoke shared test assertions.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-09-21 10:20:41 +02:00

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Markdown

---
bc-version: [all]
domain: finance
keywords: [normal-vat, automatic-vat-entry, gross-amount, net-amount, vat-posting-setup, gen-journal-line, purchase]
technologies: [al]
countries: [w1]
application-area: [all]
---
# Supply a VAT-inclusive journal Amount for automatic Normal VAT
## Description
For a general-journal line using **Automatic VAT Entry** and **Normal VAT**, `Amount` includes VAT. The posting engine extracts tax from that total; it does not add tax to a VAT-exclusive expense imported into `Amount`. An LCY invoice with net 100 and VAT 25 therefore needs a journal total of 125, not 100.
## Best Practice
Map the source's VAT-inclusive total to journal `Amount` in this posting mode. Establish the intended account and posting-group combination before validating the final amount. Account-derived VAT defaults depend on `Copy VAT Setup to Jnl. Lines`; do not assume account selection always supplies the intended configuration.
Require the actual input contract and calculation mode, not just a variable named `NetAmount`. The examples encode source net, VAT, and gross values plus a 25% Normal-VAT setup check. They target an LCY G/L purchase with 0.01 amount rounding and without balancing-side VAT, additional reporting currency, VAT differences, or unrealized VAT. Other calculation types, Manual VAT Entry, reverse charge, Full VAT, sales/use tax, unrealized tax, and other currency/rounding contexts need their own analysis; this is not a universal gross-up formula or country-specific tax advice.
The concern is the supplied transaction total, not its deductible/non-deductible allocation. Non-deductible VAT features can change the allocation of that total, not turn the source's net amount into its gross amount. Do not infer a particular expense or deductible-VAT split from this rule. The samples therefore do not depend on later-version non-deductible-VAT fields.
See sample: [`normal-vat-journal-amount-includes-vat.good.al`](normal-vat-journal-amount-includes-vat.good.al).
## Anti Pattern
In the demonstrated automatic Normal-VAT configuration, put a provably VAT-exclusive source amount into journal `Amount` while expecting posting to add tax. An amount assignment alone, unknown setup, or a suggestive variable name is insufficient. Do not report the correctly supplied gross amount or automatically rewrite tax calculations outside this scope.
See sample: [`normal-vat-journal-amount-includes-vat.bad.al`](normal-vat-journal-amount-includes-vat.bad.al).
## References
- [VAT posting setup combinations](https://learn.microsoft.com/en-us/dynamics365/business-central/finance-setup-vat#combine-vat-posting-groups-in-vat-posting-setups).
- [BCApps: journal amount validation](https://github.com/microsoft/BCApps/blob/8f7a04cb0db8aa96cb97e055c45c61aead49e280/src/Layers/W1/BaseApp/Finance/GeneralLedger/Journal/GenJournalLine.Table.al).
- [BCApps: Normal VAT extraction during posting](https://github.com/microsoft/BCApps/blob/8f7a04cb0db8aa96cb97e055c45c61aead49e280/src/Layers/W1/BaseApp/Finance/GeneralLedger/Posting/GenJnlPostLine.Codeunit.al).
- [BCApps: journal VAT amount regression cases](https://github.com/microsoft/BCApps/blob/8f7a04cb0db8aa96cb97e055c45c61aead49e280/src/Layers/W1/Tests/VAT/ERMVATOnGenJournalLine.Codeunit.al).