Extend S/4HANA Without Ever Touching Its Core
Every SAP customer eventually hits a gap between what the standard system does and what their business process actually needs. The old answer was custom ABAP code inside the core — code that made every future upgrade harder. SAP BTP's Extension Suite gives you a better answer: build the extension next to S/4HANA, not inside it.
RPTech builds custom Fiori applications, side-by-side extensions and low-code apps on SAP BTP that plug into your existing S/4HANA processes — keeping your core clean and your upgrades painless.
What We Build on the Extension Suite
Custom Fiori Applications
Purpose-built apps for processes the standard SAP screens don't cover well.
Side-by-Side Extensions
Extensions that run on BTP and call S/4HANA via APIs, leaving the core untouched.
SAP Build Apps (Low-Code)
Faster delivery of simpler applications using SAP's low-code development tools.
CAPM-Based Services
Backend services built on the Cloud Application Programming Model for scalable extensions.
RAP-Based Extensions
Modern ABAP RESTful Application Programming Model development for cloud-ready extensions.
Key User Extensibility
Lightweight, in-app extensions that business users can adapt without a full development cycle.
Our Approach
Understand the Gap
We identify exactly where the standard process falls short.
Choose the Right Pattern
Low-code, CAPM or RAP — whichever fits the complexity and timeline.
Build & Integrate
Develop the extension and connect it to S/4HANA via clean APIs.
Test & Deploy
Validate against real business scenarios before rollout.
Support & Evolve
Extensions are maintained and enhanced as requirements change.
Clean Core Principle
Every extension we build follows SAP's clean core philosophy — custom logic lives on BTP, not inside your S/4HANA system. That means your next SAP upgrade doesn't need to account for years of accumulated custom code sitting in the core.
Frequently Asked Questions
What does "clean core" mean?
It means keeping your SAP S/4HANA core system free of custom code, and instead building extensions on SAP BTP that connect to the core through standard APIs.
What's the difference between CAPM and RAP?
CAPM (Cloud Application Programming Model) is used for building services and apps directly on BTP, while RAP (ABAP RESTful Application Programming Model) is used for building cloud-ready extensions using ABAP, often side-by-side with S/4HANA.
When should we use low-code instead of CAPM or RAP?
Low-code tools like SAP Build Apps are well suited to simpler applications with straightforward logic, while CAPM and RAP are better for extensions needing complex business logic or tighter integration.
Will an extension break during an S/4HANA upgrade?
Because extensions run on BTP and integrate through stable APIs rather than modifying the core, they're designed to be far more resilient to upgrades than traditional custom code.