SAP consulting and development from Friedrichshafen, Germany
BISS&A GmbH supports SAP projects from initial requirements through to live operation: cloud applications on SAP BTP, user interfaces with SAP Fiori, development in ABAP OO, data warehousing with SAP BW/4HANA and regulatory reporting in banks.
From the user interface to the database
Services
We work across SAP technology, from the database layer to the user interface, and combine this with domain knowledge from finance and industry.
Cloud applications with the SAP Cloud Application Programming Model, SAP HANA Cloud and HDI, Cloud Foundry and Kyma. Role concept with XSUAA, connection to SAP S/4HANA through OData, release management with SAP Cloud ALM. More (German) →
entity Orders : cuid, managed {
customer: Association to Customers;
amount : Decimal(15,2);
currency: Currency;
}
service OrderService {
entity Orders as projection on db.Orders;
}Data warehouse architectures following LSA++, migration from SAP BW to SAP BW/4HANA, AMDP, CDS views, calculation views and SQLScript directly on SAP HANA. More (German) →
METHOD totals BY DATABASE PROCEDURE
FOR HDB LANGUAGE SQLSCRIPT
OPTIONS READ-ONLY USING zbalance.
et_total = SELECT account, SUM( amount ) AS amount
FROM zbalance
GROUP BY account;
ENDMETHOD.User interfaces with Fiori Elements and SAPUI5 based on OData services and CDS data models, for master data maintenance, approval processes and reporting. More (German) →
Object-oriented development in ABAP OO and ABAP on HANA, Web Dynpro, reports and enhancements, and performance optimisation of large development landscapes. More on ABAP OO (German) → More on SAP S/4HANA (German) →
Connecting generative AI to SAP landscapes through released APIs, with the Model Context Protocol (MCP) and Claude Code.
Functional and technical implementation for banks: reports to the ECB, Bundesbank, BaFin and ESMA, IFRS 9, Basel and MaRisk, credit default processing and risk reports. More (German) →
Approach
Architecture and development are handled by the same person. Design decisions are therefore not lost in a handover.
Alignment with business stakeholders, review of existing systems and data flows.
Technical specification, architecture, data model and authorization concept.
Development, automated tests, code reviews and documentation.
Go-live, release management, support and user training.
Projects
For reasons of confidentiality we do not name our clients.
2026 · Energy sector
Standard products for sales and customer management of energy suppliers on SAP BTP with CAP, CDS data models, OData services and Fiori Elements user interfaces, connected to SAP S/4HANA. A shared product core for suppliers of different sizes, quality assurance through automated tests and code reviews, release management with SAP Cloud ALM.
2025 – 2026 · Major bank
Move of risk management from an on-premise system to SAP BTP with SAP HANA Cloud. Data model and OData services with CAP, calculation engine with SQLScript in HDI containers, connection to SAP S/4HANA and reporting with SAP Fiori Elements.
2023 – 2025 · Bank
A tool that lets foreign group companies and head office bring together and analyse their balance sheets. Data model, Web Dynpro user interface with a validation rule set, calculation engine with AMDP on SAP HANA and authorization concept.
2021 – 2022 · Bank
New development of FI reporting for the regulatory reporting of outgoing payments, using Scrum. Analysis of postings from FI-AP, FI-AR and FS-CD, architecture and data model on SAP BW/4HANA; the report is sent to BaFin as XML via a web service.
2020 – 2021 · Bank
Processing of customer and contract defaults for all connected international institutions. Daily processing from the data warehouse and architecture for global reporting through to the risk report.
2019 – 2020 · Bank
Migration of the data warehouse from SAP BW 7.5 on HANA to SAP BW/4HANA with LSA++. Virtual modelling with Open ODS views and CDS views, logic pushed down via AMDP, alongside development of queries for ECB reporting.
2018 – 2019 · Bank
Implementation of the ESMA requirements for securitisations in the United Kingdom, the Netherlands and Spain on SAP BW on HANA, with native HANA models and classes in AMDP and ABAP OO.
2017 – 2018 · Bank
Enhancement of an overarching data warehouse on SAP BW 7.5 on HANA, integration of foreign group companies via a Hadoop data lake. Transformations with AMDP and native SQL, routines for default and probability of default directly on SAP HANA.
2015 – 2016 · International bank
Greenfield project: all risk types in one uniform BW architecture following LSA++ and a risk report for all German and foreign branches, plus master data and approval tools in Web Dynpro.
Further projects, including projects in automotive, pharma and retail, are listed in our project profile, available on request.
Blog
9 November 2026
Before building an interface, four things should be settled: who owns it, which system leads, how current the data must be and whether an event or a synchronous call fits.
6 November 2026
Fiori Elements generates user interfaces from annotations. Where that works, where extension points help and when a freestyle SAPUI5 application is the better fit.
5 November 2026
Point-to-point interfaces make every change expensive. SAP BTP addresses this on three levels, and AI tools add a fourth reason.
About
Managing Director · Senior SAP Developer & Architect
Christian Buck handles both architecture and development in his projects. He has led development teams and sub-projects, advised business units and trained users in SAP front-end technologies.
His degree in economics from Heidelberg helps him to grasp business requirements in finance and risk quickly.
Contact
For project enquiries or an initial conversation about your plans.
BISS&A GmbH · Kranichweg 10 · 88048 Friedrichshafen · Germany