bcquality/microsoft/knowledge/finance/write-dimensions-as-dimension-set-entries.md
Jesper Schulz-Wedde fa63d5526c 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>
2026-09-17 16:09:17 +02:00

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---
bc-version: [all]
domain: finance
keywords: [dimension-set-id, shortcut-dimension, global-dimension, journal-line, posting, copy-dimensions]
technologies: [al]
countries: [w1]
application-area: [all]
---
# Copy complete posting dimension sets, not only shortcut projections
## Description
When a journal line or posting document inherits dimensions, its `Dimension Set ID` identifies the complete combination of `Dimension Set Entry` rows. Global and shortcut dimensions expose selected dimensions, not the complete set; the eight shortcut dimensions are not a limit on set membership. Copying only these projections can leave the destination's posting dimensions unchanged or silently lose dimensions outside the shortcuts.
## Best Practice
For an intentional **complete** dimension transfer, copy the source set ID and synchronize the destination's projections through its supported validation or dimension-management routine. On `Gen. Journal Line`, `Validate("Dimension Set ID", SourceSetID)` updates the two shortcut fields. Do not assume another table has the same validation trigger.
When line-specific dimensions must survive a header change, use the appropriate set-combination or delta routine instead of blindly replacing the line's entire set. Reading or filtering a known global dimension is legitimate; it is not a claim to enumerate every dimension. This rule owns dimension transfer through existing journal/document posting records, not custom-table or master `Default Dimension` wiring, which belongs to data modeling.
See sample: [`write-dimensions-as-dimension-set-entries.good.al`](write-dimensions-as-dimension-set-entries.good.al).
## Anti Pattern
A routine intended to copy **all** posting dimensions copies only global/shortcut codes, or assigns a set ID without synchronizing the destination's stored projections. Require evidence of a complete-transfer intent and inspect surrounding validation; an explicit change to one selected dimension or a read-only filter is not this defect.
See sample: [`write-dimensions-as-dimension-set-entries.bad.al`](write-dimensions-as-dimension-set-entries.bad.al).
## References
- [Dimension set entries overview](https://learn.microsoft.com/en-us/dynamics365/business-central/design-details-dimension-set-entries-overview).
- [DimensionManagement API](https://learn.microsoft.com/en-us/dynamics365/business-central/application/base-application/codeunit/microsoft.finance.dimension.dimensionmanagement).
- [BCApps: Gen. Journal Line dimension validation](https://github.com/microsoft/BCApps/blob/8f7a04cb0db8aa96cb97e055c45c61aead49e280/src/Layers/W1/BaseApp/Finance/GeneralLedger/Journal/GenJournalLine.Table.al).