bcquality/microsoft/knowledge/finance/reverse-transactions-by-transaction-number.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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---
bc-version: [all]
domain: finance
keywords: [reversetransaction, reverseregister, transaction-no, entry-no, reversal-entry, g-l-register]
technologies: [al]
countries: [w1]
application-area: [all]
---
# Pass the transaction number, not a ledger-entry number, to ReverseTransaction
## Description
`Reversal Entry.ReverseTransaction` expects a **transaction number**, while `ReverseRegister` expects a **G/L register number**. Neither parameter means a ledger `Entry No.`. All are integers, so the compiler accepts the wrong identity; a coincidentally matching integer can select another transaction instead of the posting the user intended to reverse.
## Best Practice
When starting from a `G/L Entry`, fetch that entry and pass **its** `Transaction No.` to `Reversal Entry.ReverseTransaction`, as the sample does. The same identity distinction applies to customer/vendor ledger entries when using their supported transaction-reversal path. If the starting point is a G/L register, use `Reversal Entry.ReverseRegister` with that register's number. The interactive workflow collects the participating entries and validates reversal eligibility before the user posts the reversal.
Do not infer eligibility from `Open` alone or bypass a rejection by changing origin, application, or reversal fields. The supported path depends on source and state; some postings require unapplication or a correcting document first. A request to reverse is not a guarantee that reversal will be permitted. This rule concerns the two named `Reversal Entry` APIs, not routines such as `UnApplyCustLedgEntry` that legitimately accept a ledger entry number.
See sample: [`reverse-transactions-by-transaction-number.good.al`](reverse-transactions-by-transaction-number.good.al).
## Anti Pattern
Pass a ledger entry's `Entry No.` or a register number into `ReverseTransaction`, or pass a ledger-entry/transaction number into `ReverseRegister`. Require visible value provenance, not merely a suspicious variable name or an arbitrary integer. A correctly sourced transaction number is valid even when the variable is poorly named.
See sample: [`reverse-transactions-by-transaction-number.bad.al`](reverse-transactions-by-transaction-number.bad.al).
## References
- [Reversal Entry API](https://learn.microsoft.com/en-us/dynamics365/business-central/application/base-application/table/microsoft.finance.generalledger.reversal.reversal-entry).
- [Reverse journal postings](https://learn.microsoft.com/en-us/dynamics365/business-central/finance-how-reverse-journal-posting).
- [BCApps: reversal entry selection](https://github.com/microsoft/BCApps/blob/8f7a04cb0db8aa96cb97e055c45c61aead49e280/src/Layers/W1/BaseApp/Finance/GeneralLedger/Reversal/ReversalEntry.Table.al).