What Technical Consultants Need to Know Before Migrating from Oracle EBS to Fusion Cloud

TECHNICAL MIGRATION // ORACLE EBS → FUSION CLOUD

What Technical Consultants Need to Know Before Migrating from Oracle EBS to Fusion Cloud

Migrating to Fusion isn't a database move — it's a shift from direct table access to a service-oriented, API-first architecture. Here's how to think about that shift before development starts.

Custom Application
↓
Custom PL/SQL
↓
EBS Database Tables
↓
Business Transaction
External Application
↓
REST / SOAP / Integration
↓
Fusion Business Services
↓
Fusion Cloud Application

For a technical consultant, moving from EBS to Fusion is not simply a matter of migrating data and recreating existing custom programs. The underlying technical approach is fundamentally different — and that changes the question worth asking.

Not "how do we move everything from EBS to Fusion?" — but "how do we transform our existing EBS capabilities into a modern, supported Fusion Cloud architecture?"
01

Understand the architectural shift

Fusion Cloud should not be treated as an EBS database migration. In EBS, technical teams commonly work directly with tables such as MTL_SYSTEM_ITEMS_B, PO_HEADERS_ALL, AP_INVOICES_ALL and GL_JE_HEADERS. In Fusion, that same work happens through business services, exposed via REST and SOAP — there is no equivalent direct line into the database. Use the toggle in the diagram above to see both models side by side.

From PL/SQL to APIs

PL/SQL remains genuinely useful — it builds a strong foundation in SQL, data relationships, transaction processing and troubleshooting. But on its own it isn't enough anymore. It needs to be paired with cloud-native skills:

REST APIsSOAP servicesJSON / XML Auth & tokensHTTP status codesPagination Error handlingIntegration architecture

This architectural change belongs in the design phase — not as an afterthought once migration development is already underway.

02

Don't migrate customizations blindly

Most mature EBS environments carry years of Forms Personalizations, OAF Personalizations, custom PL/SQL packages, concurrent programs, custom tables, reports, workflows and interfaces. The common mistake is assuming every one of them must be rebuilt in Fusion. Instead, each customization deserves a fit-gap and rationalization pass — click a card to see the recommended path.

+
Still critical
Business-critical customization
Redesign it using supported Fusion capabilities rather than porting the old logic as-is.
+
Now standard
Replaced by standard functionality
Retire it. Fusion's out-of-the-box behavior already covers the requirement.
+
Unused
No longer used
Remove it. Confirm with the business owner, then let it go.
+
Reporting
Reporting requirement
Evaluate OTBI, BI Publisher or Analytics based on what the report actually needs to answer.
+
Integration
Integration requirement
Rebuild on REST, SOAP or an integration platform instead of a database link.
+
Custom app
Custom application requirement
Consider APEX, Visual Builder or another supported extension pattern.
+
Historical
Historical requirement
Consider archival instead of migration — not every record needs to become live data.

The goal isn't to reproduce the EBS environment inside Fusion — it's to simplify the solution while preserving the required business capability.

Rather than "how can I recreate this OAF customization in Fusion?" — ask "what business requirement does this customization solve, and what is the supported Fusion mechanism for achieving it?"
03

Data, reporting and integration need to be redesigned

These three areas change in different ways. Switch between the tabs below.

Data migration
Reporting
Integration

Data migration is more than extracting records from EBS and loading them into Fusion. A robust process runs through several checkpoints, not a single load-and-done step:

EBS data→ Assessment→ Cleansing→ Mapping→ Transformation→ Migration→ Validation→ Reconciliation

For each data set — master data, reference data, open and historical transactions — ask a simple question: does this need to be migrated into Fusion, or is historical access sufficient? Matching record counts on both sides isn't proof of a clean migration; reconciliation also needs to check identifiers, amounts, dates, statuses and transaction relationships.

Avoid converting every EBS report one-for-one. Discoverer reports, XML Publisher output and custom reporting tables should each be traced back to the business requirement first, then rebuilt on the Fusion data source that actually fits:

Existing EBS report→ Business requirement→ Fusion data source→ OTBI / BI Publisher / Analytics

Choose the reporting technology based on what the report needs to do, not on a mechanical technical conversion.

Interfaces built on database links and interface tables don't carry across. A modern integration goes through Oracle Integration and REST/SOAP endpoints instead:

External system→ Oracle Integration→ REST / SOAP→ Fusion Cloud

Design for authentication, validation, retries, monitoring and reprocessing up front — and never let an integration fire thousands of unbatched API calls without accounting for performance and rate limits.

04

Security and extensions

An EBS responsibility does not map cleanly onto a single Fusion role — the underlying models are structured differently.

EBS security
Responsibility
↓
Menu / Function
↓
Data Access
Fusion security
Job Role
↓
Duty Role
↓
Privileges
↓
Data Security

Before mapping anything, the migration team needs to understand what activities each user performs, which business units and data they need access to, what approvals apply, and whether any segregation-of-duties conflicts exist.

Where APEX fits

Not every requirement needs to live inside Fusion itself. APEX, sitting on top of Fusion's REST APIs, is a reasonable home for supporting applications, admin tools, exception management and dashboards — keeping the Fusion core clean while still meeting the requirement.

Extend Fusion where necessary, but keep the Fusion core as clean as possible.
05

Preparing the EBS technical team for Fusion

An EBS technical consultant already brings SQL, PL/SQL, data modeling, transaction processing, Forms, OAF and troubleshooting experience — that foundation doesn't go to waste. Click below to see what gets layered on top of it.

SQLPL/SQLEBS architecture Concurrent processingForms / OAFTroubleshooting
REST / SOAPJSON / XML IntegrationFusion security BI Publisher / OTBIAPEX / extensions Cloud architecture

The modern Oracle technical consultant needs to think beyond database-centric development and understand the full application ecosystem — APIs, integration, security and supported extensions together.

TAKEAWAYS

Nine lessons worth keeping on the wall

These are the principles worth returning to at every stage of an EBS-to-Fusion project. Check off the ones your team has already internalized.

0 / 9 checked
  • Don't treat Fusion as an EBS database migration.
  • Assess and rationalize existing customizations before rebuilding them.
  • Replace direct database dependencies with supported APIs and services.
  • Redesign reports around business requirements, not a technical conversion.
  • Build data reconciliation into the migration strategy from day one.
  • Design integrations with security, monitoring, error handling and scale in mind.
  • Understand Fusion's role and data-security model before mapping responsibilities.
  • Use APEX, Visual Builder and other supported extensions where appropriate.
  • Treat the migration as a chance to eliminate technical debt, not carry it forward.

CLOSING THOUGHT

Not "how do we make Fusion behave exactly like our EBS system?"
But "how can we use Fusion Cloud capabilities to deliver the same business outcomes with a simpler, more scalable and maintainable architecture?"

That change in mindset is what separates a traditional EBS developer from a modern Oracle Cloud Technical Consultant and Architect.

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