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bcquality/microsoft/knowledge/finance/multi-currency-rounding.md
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

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bc-version domain keywords technologies countries application-area
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finance
multi-currency
rounding
currency-precision
invoice-rounding
fcy-lcy
al
w1
finance

Multi-currency rounding

Description

Every Currency record (table 4) declares four rounding precisions that govern how BC handles foreign-currency (FCY) amounts: Amount Rounding Precision (typically 0.01), Unit-Amount Rounding Precision (typically 0.00001, used for unit prices), Invoice Rounding Precision (typically 0.01, the tolerance that lets an invoice round to a "clean" final amount), and Appln. Rounding Precision (tolerance for closing applications across currencies). The four precisions interact with the local currency's precision to determine what amounts a document ends up posting.

At post time the codeunit computes three amounts per line: the FCY amount (rounded to Amount Rounding Precision), the LCY amount (FCY × exchange rate, rounded to the local currency's precision), and any residual that falls to the Invoice Rounding account configured on the Customer/Vendor Posting Group. Rounding conflicts appear when: (a) LCY precision is coarser than FCY — JPY bookkeeping with EUR documents rounds to whole yen but allows 0.01 EUR; (b) per-line rounding on a many-line document diverges from single-line rounding of the document total; (c) the exchange rate changes between an order's receipt and its invoice, and the rounding residual shifts.

Best Practice

Use the Invoice Rounding account purposefully — set it to a dedicated G/L account so the residuals aggregate where finance can review them. A catch-all "other income" lumps them with real transactions and hides rounding drift.

Anti Pattern

Disabling Invoice Rounding by setting the precision to 0. The residuals then split across every VAT and payment account, making period-end reconciliation a hunt for pennies that do not belong to any transaction.

Provenance

Migrated from microsoft/BCAppsTriage's plugins/triage/skills/triage/references/area-knowledge/finance.md (section: "Multi-Currency — Rounding and Exchange Rates") on 2026-04-21.