ABAP, RAP and clean core development
Custom code is where most of an SAP system's upgrade risk lives. We write new ABAP the clean way, remediate old code for S/4HANA, and reduce the custom footprint you carry from release to release.
Clean core, level by level
In 2025 SAP replaced its earlier three-tier extensibility model with four clean core levels. Level A uses only released, stable APIs, either in ABAP Cloud or side by side on BTP. Level B adds classic APIs that are documented and generally upgrade-stable. Level C touches internal SAP objects, which works but needs watching at each upgrade. Level D covers modifications, direct writes to SAP tables and implicit enhancements, and is where technical debt accumulates.
Few companies can be all Level A overnight. The practical goal is that new code starts at A or B, and the C and D code you already have shrinks every year. We set up the ATC checks that make that measurable.
Development services
- Custom code migration
- Usage analysis to retire dead code, ATC remediation for S/4HANA simplification items, and fixes for data model changes such as material number length and the Universal Journal.
- RAP and ABAP Cloud
- Business objects, behaviour definitions and OData V4 services with the ABAP RESTful Application Programming Model, on-stack or in the BTP ABAP environment.
- CDS and AMDP
- Virtual data models, analytical queries and code pushdown to HANA for reports that used to take hours.
- Interfaces
- IDocs, BAPIs, RFC-enabled function modules, SOAP and REST services, proxies and AIF monitoring.
- Forms and output
- Adobe Forms, Smart Forms and output management in S/4HANA for invoices, delivery notes, labels and statutory documents.
- Enhancements and workflow
- BAdIs, enhancement spots, user exits where unavoidable, and SAP Business Workflow and flexible workflow.
- Legacy technologies
- Web Dynpro, BSP, CRM WebClient UI, Interactive Adobe Forms, SAP Java Connector and NetWeaver Java, still running in many landscapes and still needing support.
- Performance
- SQL trace and runtime analysis, HANA-optimised rewrites and fixes for the batch jobs that keep missing their window.
Tools and techniques
Development
- ABAP Development Tools (Eclipse)
- ABAP Cloud
- RAP
- CDS
- AMDP
- abapGit and gCTS
Quality
- ABAP Test Cockpit
- Custom Code Migration app
- ABAP Unit
- Code Vulnerability Analyzer
- SQL Monitor
Integration
- IDoc and ALE
- BAPI and RFC
- OData V2 and V4
- SOAP and REST
- Application Interface Framework
Explore the SAP practice
S/4HANA and ERP transformation
Platform, AI and data
Finance and revenue
Supply chain, manufacturing and assets
People, spend and customers
Plan the next step with us
Share what you're working on. We'll tell you how we'd approach it and who would do the work.