// Source System
Sage to Dynamics 365 Data Migration
We've moved nominal ledgers, sales and purchase ledgers out of Sage into D365 F&O — cleanly, completely, on time.
SAGE 200 — Entity Mapping
// The Challenge
Why Sage migrations are hard.
Sage 200 and Sage 50 organise finance around a Nominal Ledger with account codes and, in larger implementations, analysis codes layered on top for departmental or cost-centre reporting. Those analysis codes don't map one-to-one onto D365's financial dimensions — they need an explicit design decision about which becomes a dimension and which becomes part of the main account.
The Sales Ledger and Purchase Ledger hold customer and vendor records with open item ageing that must be preserved through migration so debtor and creditor reports tie out on day one. Where a business has run multiple Sage companies for group entities, consolidating them into D365's legal entity model is usually the single biggest design conversation.
Stock records in Sage 200 are typically simpler than in larger ERPs, but bill-of-materials and stock take history can still carry inconsistencies that surface once data volume increases at migration.
// Mapping
Sage entities, mapped to D365.
| Source entity | D365 entity |
|---|---|
| Nominal Ledger — Account codes | MainAccount |
| Sales Ledger — Customer accounts | CustTable |
| Purchase Ledger — Supplier accounts | VendTable |
| Nominal Ledger — Analysis codes | Financial dimensions |
| Stock records — Item master | InventTable |
// Pitfalls
Where Sage migrations go wrong.
- Analysis codes layered over the nominal ledger don't map one-to-one onto D365 dimensions — decide the mapping before build, not during UAT.
- Multiple Sage companies for group entities usually need consolidating into D365's legal entity model — plan this early with finance.
- Open item ageing in the Sales and Purchase Ledgers must be preserved exactly, or debtor/creditor reports won't tie out at go-live.
- Sage 50 and Sage 200 have materially different underlying structures — confirm which variant you're on before scoping.
// Domains
Domains we most commonly migrate from Sage.
// Methodology
The same six phases, every time.
01
DISCOVER
Profiling, volumes, quality scoring across every source system in scope.
02
DESIGN
Source-to-target mapping and the cleansing plan, agreed before build starts.
03
BUILD
DMF templates, KingswaySoft packages, SQL staging tables.
04
TEST
Two mock migrations, full reconciliation, and UAT sign-off.
05
CUTOVER
Final load, balance reconciliation, go-live clearance.
06
STABILISE
Corrections, closure report, retainer option for what follows.
// FAQ
Questions about migrating from Sage.
Yes, though the underlying data structures differ significantly, so we scope discovery separately for each.
Planning a Sage to D365 migration?
Start with a Health Check to see exactly what needs cleansing before it moves.