What are SAP Side by Side Extensions?
Definition
SAP Side by Side Extensions are external applications or services built alongside SAP systems rather than directly inside the SAP core. They extend SAP capabilities through APIs, events, integrations, and cloud services while keeping the main ERP environment focused on stable finance, procurement, sales, HR, and operational processing.
For finance teams, SAP Side by Side Extensions can support financial reporting, approval controls, tax checks, treasury visibility, supplier portals, customer service, and management dashboards without changing the core SAP transaction design.
How SAP Side by Side Extensions Work
Side by side extensions connect with SAP through standard services, APIs, events, identity controls, and integration layers. The extension may run on SAP Business Technology Platform or another approved environment while reading or writing selected SAP data based on business rules and authorization settings.
For example, a finance team may build an external cash planning application that reads open receivables, payables, and bank data from SAP to improve cash flow forecasting. Another extension may support invoice validation, supplier onboarding, or customer credit review.
Core Extension Types
SAP Side by Side Extensions are useful when a company needs additional capability while keeping SAP core processes clean and governed.
Finance dashboards for management reporting and KPI tracking.
Supplier applications for onboarding, document submission, and vendor communication.
Customer applications for order status, billing inquiries, and account updates.
Approval applications connected to payment approvals and spend controls.
SAP Fiori Extensions for user-facing tasks and role-based screens.
SAP Low Code Extensions for guided applications created with standardized development tools.
Finance and Business Use Cases
Finance teams use SAP Side by Side Extensions when standard ERP functionality needs a complementary application, workflow, or analytical view. Common use cases include supplier risk review, accounts payable validation, customer dispute tracking, expense approvals, cash visibility, revenue dashboards, and reconciliation controls.
In transaction-heavy environments, side by side extensions can also support journal review, intercompany workflows, invoice evidence capture, and Top-Side Journal Entry approval tracking. For M&A or legal-finance workflows, extensions may connect due diligence records, tax review outputs, and contract evidence with SAP reporting structures.
Relationship with Other SAP Extensions
SAP Side by Side Extensions differ from embedded enhancements because they run outside the SAP core while still exchanging data with SAP. SAP ABAP Extensions are typically closer to the SAP application layer and may support custom reports, validations, or forms. Side by side extensions are often selected when the organization wants a separate application experience, broader integration, or cloud-native development pattern.
For deal-related finance processes, extensions may support Buy Side Due Diligence, Sell Side Due Diligence, Buy Side Tax Due Diligence, or Sell Side Tax Due Diligence by connecting review findings with finance master data, contracts, entities, and reporting outputs.
Best Practices
Effective SAP Side by Side Extensions depend on clear ownership, approved APIs, strong data governance, and finance validation. Each extension should have a defined business purpose, data scope, control owner, and reporting impact before it is moved into production.
Use standard SAP APIs and documented integration patterns.
Align extension data with finance master data and reporting dimensions.
Validate outputs against reconciled SAP records.
Document ownership, access rules, and approval responsibilities.
Include audit evidence for finance-critical extensions.
Summary
SAP Side by Side Extensions add external applications and services around SAP without embedding every change directly into the ERP core. They support financial reporting, cash flow forecasting, supplier workflows, approval controls, due diligence activities, Fiori apps, low-code applications, and business performance management through connected, governed extension design.