Case study / Technical Documentation
SAP BTP Extensibility Governance
Defined SAP BTP extensibility standards to support a Clean Core S/4HANA strategy.
StackSAP BTP · Technical Documentation
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The project in about ten seconds.
Focus
Technical Documentation
Challenge
Teams needed clearer guidance on when to use Side-by-Side versus In-App extensibility, which services to adopt, and how to align new development with Clean Core principles.
My contribution
Produced SAP BTP extensibility guidance supporting a Clean Core S/4HANA strategy. Translated SAP guidance into a practical standards document teams could use when evaluating extension approaches.
Outcome
Clean Core Standards Defined
- Deliverable
- Standards
- Focus
- Clean Core
- Format
- Guidance
Business Challenge
What was at stake
An enterprise S/4HANA initiative committed to Clean Core principles, but development teams lacked clarity on when to use Side-by-Side versus In-App extensibility, which BTP services to adopt, and how to document decisions for governance review.
Key Problems
- Teams making divergent platform choices without shared rationale
- Risk of polluting core S/4 customizations against Clean Core intent
- No documented decision criteria for Side-by-Side versus In-App
- Governance reviews becoming bottlenecks instead of accelerators
- Extensibility knowledge concentrated in individuals rather than artifacts
Stakeholders Affected
SAP architecture leads, development team leads, enterprise architecture, and S/4 implementation partners responsible for cross-team delivery.
Technical Approach
Standards as a decision aid, not a barrier
Analyzed the existing SAP landscape and team archetypes, mapped extensibility scenarios to recommended BTP services, and produced a standards document with decision trees and patterns development teams could apply during sprint planning—not just at architecture review.
Reviewed the current landscape and identified extensibility decision points
Cataloged BTP services relevant to common extension scenarios
Documented reusable extensibility patterns
Authored 12 governance guidelines aligned to Clean Core
Engaged 8 stakeholders across architecture and delivery for validation
The Process
Project Lifecycle
Reviewed the current SAP landscape and identified governance gaps and extensibility decision points.
Evaluated SAP BTP services and documented recommended patterns for Side-by-Side and In-App extensibility.
Execution Approach
Governance Strategy
Extensibility decision path
From business need to Clean Core-aligned pattern
SAP BTP governance
Business need
What must change?
Extension type
In-app or side-by-side
BTP pattern
Service + integration fit
Clean Core check
Upgrade-safe boundary
IN-APP
Use when the requirement fits supported S/4HANA extension points.
SIDE-BY-SIDE
Use SAP BTP when decoupling, independent lifecycle, or broader services are needed.
STANDARD
Document the decision criteria so teams can apply the same reasoning consistently.
Architectural Decisions
Choices that shaped the build
Pattern-based guidance over case-by-case review
Decision
Document recurring patterns rather than rule on every new request.
Rationale
Scales governance—teams self-serve common cases and review focus shifts to genuine exceptions and net-new patterns.
Side-by-Side as the default for net-new functionality
Decision
Recommend BTP Side-by-Side extensibility as the default unless In-App is clearly superior.
Rationale
Preserves Clean Core, isolates lifecycle from S/4 upgrade cycles, and keeps custom logic on platform services that evolve independently.
Decision criteria over prescriptive rules
Decision
Provide decision criteria—data location, transactional vs analytical, upgrade tolerance—rather than blanket "always use X."
Rationale
Real extension cases vary. Criteria empower teams to choose correctly with documented accountability instead of forcing exceptions.
Living-document approach
Decision
Frame the governance document as an iterating standard, not a frozen artifact.
Rationale
BTP services evolve. Standards must too, or teams will route around them within a release cycle.
Key Tradeoffs
What was chosen, and against what
Format of guidance
Chose
Principle-based guidance with examples
Instead of
Full prescription per BTP service
Reasoning
Prescription dates quickly and discourages judgment. Principles outlast specific service versions and survive product roadmap changes.
Review process
Chose
Self-service patterns with escalation criteria
Instead of
Mandatory architecture review per change
Reasoning
Velocity versus control. Review fatigue erodes governance quality. Reserve review for non-pattern cases where it adds value.
Extensibility default
Chose
Conditional In-App where transactional extensions are tightly bound to core
Instead of
Strict Side-by-Side only
Reasoning
Strict Side-by-Side adds latency and integration cost when the extension genuinely belongs in core. Principle, not absolutism.
Outcomes
Proof in production
Key outcome
Clean Core Standards Defined
Standards
Deliverable
Clean Core
Focus
Guidance
Format
Qualitative Outcomes
Beyond the numbers
- Shared vocabulary across teams for extensibility decisions
- Reduced ad hoc architecture choices on new work
- Documented patterns reusable across waves of delivery
- Clearer escalation path for non-standard scenarios
- Standards artifact suitable for audit and onboarding new teams
Lessons Learned
What generalizes
- 01
Governance documents that aren't actionable during sprint planning don't get used. Format matters as much as content.
- 02
Stakeholder validation isn't a checkbox—it surfaces real tradeoffs developers face that architects miss.
- 03
Standards must reference the BTP services and patterns developers actually have access to. Abstraction kills adoption.
- 04
Document the "why" alongside the "what." Teams stop following rules they don't understand the moment tradeoffs emerge.
- 05
Living standards need an owner. Orphan documents drift from reality within a release cycle.
When This Approach Makes Sense
Is this a fit for your program?
Strong fit when
- S/4HANA program is committed to Clean Core principles
- Multiple development teams build extensions in parallel
- Architecture review is becoming a bottleneck or rubber stamp
- Extensibility knowledge is locked in individuals rather than artifacts
- Governance artifacts are needed for audit, vendor management, or CoE rollout
Probably not when
- Single team and limited extension scope—informal patterns suffice
- No commitment to Clean Core—governance assumes the goal exists
- Standards work isn't sponsored by architecture leadership
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