The authors of »Core Data Services for ABAP«

Renzo Colle

Photo of Renzo Colle
Renzo Colle is currently responsible for the end-to-end programming model of SAP S/4HANA in the central architecture group. He studied business mathematics at the Karlsruhe Institute of Technology ( and has worked at SAP for more than 25 years in a wide variety of areas and roles. He started his career at SAP as a developer in strategic customer development. In SAP Business ByDesign, he was responsible for logistics and lead architect of the SAP ByDesign platform for cloud applications. As the inventor of the Business Object Processing Framework (BOPF) and lead architect of the ABAP RESTful application programming model, he has worked on model-driven software development and transactional applications for more than 20 years. Further information about Renzo can be found at

Ralf Dentzer

Photo of Ralf Dentzer
Ralf Dentzer has been working for several years in the central architecture group of the SAP S/4HANA suite with a focus on the use of core data services in SAP S/4HANA. He joined SAP more than 25 years ago. He developed HR applications for SAP R/3, SAP ERP, and SAP Business ByDesign. After that, his tasks shifted to questions of overall architecture for new solutions. Ralf studied mathematics and received his doctorate from the University of Heidelberg. He is married and has two adult sons.

Jan Hrastnik

Photo of Jan Hrastnik
Jan Hrastnik is a member of the SAP S/4HANA cross architecture team, where he focuses on the virtual data model and the use of core data services in ABAP applications. He has worked in various SAP development areas for more than 20 years. At the beginning of his career, he supported numerous customer projects in the automotive industry. Subsequently, he worked in the supply chain management development of SAP Business ByDesign. Jan’s work initially focused on developing the master data required for the production processes before he took on overarching expert tasks for central architecture topics. He then worked on the SAP SuccessFactors Employee Central solution and native SAP HANA application development.
Print edition E-book Bundle