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Jesper Schulz-Wedde 7fbb121c24 Add unit tests and knowledge files for BC domain context

- Introduced unit tests for the bc-domain-context implementation, covering various scenarios including filtering by application area, technology mismatches, layer precedence, and conditional applicability.
- Added knowledge files related to finance, including topics such as Chart of Accounts, Codeunit 12, Dimension Management, and VAT on prepayment chains, among others.
- Each knowledge file includes structured metadata and best practices to enhance the domain knowledge available for Business Central tasks.

2026-04-22 11:33:47 +02:00

2.1 KiB

Raw Blame History

bc-version

domain

keywords

technologies

countries

application-area

1..99

finance

vat

vat-posting-setup

vat-business-group

vat-product-group

reverse-charge

full-vat

finance

VAT posting setup

Description

VAT Posting Setup (table 325) is the matrix that tells Business Central how to compute VAT for every combination of VAT Business Posting Group (who the counterparty is — domestic, EU, export) and VAT Product Posting Group (what is being transacted — standard goods, reduced-rate goods, exempt services). Each cell of the matrix declares the VAT % and the VAT Calculation Type that applies when that combination appears on a posting.

Three calculation types cover the common cases. Normal VAT applies the rate as a percentage of the line amount — the standard sales/purchase tax path. Reverse Charge VAT records the VAT on both sides of the transaction without a cash movement; the buyer, not the seller, is responsible for remitting it to the authority. Full VAT treats the entire line amount as VAT with no underlying taxable base — used for VAT-only correction documents. Every posted line in the document flows through the matching cell; misconfigured cells produce posting errors, incorrect returns, or off-balance VAT accounts.

Best Practice

Populate the full matrix, including "not applicable" cells (with zero rate and a note). Missing cells produce an error message that names the combination the user tried to use, which is clearer than an unexpected zero-rate post that would mask the misconfiguration.

Anti Pattern

Creating a single catch-all VAT Business Group for "everyone" and a single VAT Product Group for "everything." Reporting the VAT return later becomes impossible because every transaction collapses into one cell; the Authority requires transaction-level breakdown.

Provenance

Migrated from microsoft/BCAppsTriage's plugins/triage/skills/triage/references/area-knowledge/finance.md (section: "VAT Calculation") on 2026-04-21. To be refined in Phase 2 from D:\Repos\NAV\App\Layers\W1\BaseApp\Finance\VAT\.

2.1 KiB Raw Blame History