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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>
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Apply and unapply entries through the application workflow, not status flags
Description
Customer/vendor settlement is a posting operation involving detailed ledger entries, not just a change to Open on the main entry. Remaining amounts are calculated from detailed entries. Unapplication posts correcting entries and handles application-derived effects such as discounts and currency gains/losses; deleting details or changing Unapplied cannot reproduce that history.
Best Practice
Use "CustEntry-Apply Posted Entries" / "VendEntry-Apply Posted Entries" and the supported application or unapplication workflow. Let it check application dates, entry state, and application ordering. The ApplyCustEntryFormEntry / ApplyVendEntryFormEntry and UnApply...LedgEntry methods are interactive: users select and confirm the operation. They are not unattended "mark paid" APIs.
For programmatic posting, use the target version's public Apply / PostUnApply... APIs with properly prepared selection and Apply Unapply Parameters; handle cancellation and the workflow's transaction/commit behavior. "Applying Entry", "Applies-to ID", and "Amount to Apply" are legitimate application-preparation fields. Do not report their writes alone, temporary buffers, supported posting/compression internals, or unrelated operational/extension fields.
See sample: apply-ledger-entries-through-application-codeunits.good.al.
Anti Pattern
Implement payment matching, settlement, or reopening by directly persisting Open, "Closed by Entry No.", closure amounts/dates, or detailed-entry unapplication flags, or by deleting/rewriting detailed application amounts. Require confirmed writes to existing non-temporary records and settlement intent. Do not suggest assigning a Remaining Amount FlowField as a fix.
This article owns fabricated application state. Use the posted-financial-content rule for original accounting-value corrections, not a second finding prescribing the same application fix.
See sample: apply-ledger-entries-through-application-codeunits.bad.al.