There are two main approaches when moving from SAP BW to SAP BW/4HANA.
Watch the following video to get an overview of the different paths to SAP BW/4HANA.
Let's recap on the key migration approaches:
1. In-Place Conversion (Full System Conversion):
- Target group: Customers who want to change their current SAP BW system into an SAP BW/4HANA system and who are already on an up-to-date release (preferable 7.5 powered by SAP HANA).
- In-place conversion means the customer keeps the existing BW system and transfers it to SAP BW/4HANA (keeping the system ID (SID) same).
- Approach without re-implementation; there is no disruption for existing business processes.
- SAP provides tool support for all tasks: database migration (SUM-DMO or SWPM), ABAP release upgrade (SUM), and BW application conversion to SAP BW/4HANA (BW/4HANA Transfer Cockpit).
- Release requirements: SAP BW 7.5 SP05 powered by HANA, but recommendation is a current SP level.
- Generally available since March 2018.
2a. New Installation (Standard Greenfield Approach):
- Target group: SAP customers or net new customers.
- New installation of SAP BW/4HANA, for example, for customers setting a new greenfield SAP S/4HANA environment and in this project they also start from scratch with SAP BW/4HANA.
- Build a system from scratch with a new data model and load only relevant data from existing source systems.
- Re-engineering and process simplification based on modern data warehouse architecture.
2b. Shell Conversion (Accelerated Greenfield Approach):
Target group: SAP Business Warehouse customers or net new customers.
For customers who want a fresh start, SAP offers an option to transport certain objects (metadata of data models) from the existing SAP BW system to a newly installed SAP BW/4HANA system. These objects are converted into SAP BW/4HANA-supported objects during import into the SAP BW/4HANA system (for example, InfoCube –> ADSO).
Neither master data nor transaction data are transferred. The data has to be re-loaded from the original sources or from the original BW system.
The technical solution is similar to remote conversion but without data transfer.
Release requirements for original SAP BW system: SAP BW 7.x (regardless of which database).
Generally available from March 2018.
2c. Remote Conversion:
Target group: Customers who want to change their current SAP BW system into an SAP BW/4HANA system and who are on an older release level and not on SAP HANA.
Remote conversion means the customer builds up a new SAP BW/4HANA system (new SID) and transfers BW applications (meta data) and data (master data, transactional data) from the original SAP BW system.
Opportunity to pick and choose only future-proof data flows to build a clean, new SAP BW/4HANA environment.
Convert BW objects into the newly installed SAP BW/4HANA system. Multiple persistent BW objects like InfoCubes, classic DataStore objects, and optionally PSAs are replaced by advanced DataStore objects; MultiProviders and InfoSets become CompositeProviders.
No database migration or BW application upgrade required.
Release requirements for original SAP BW system: SAP BW 7.3 (regardless of which database).
General availability from April 2019.
3. Landscape Transformation:
Target group: Customers who want to consolidate their SAP BW landscape (multiple production systems) or carve out selected data models or flows into a global, new SAP BW/4HANA system. These customers run multiple SAP BW, SAP BW on SAP HANA systems, or hybrid cases.
Customer-specific conversion project required with guidance of SAP and SAP's tools for this scenario (service offering from SAP's Data Management & Landscape Transformation group).
Stay with current data warehouse landscape and move gradually to SAP BW/4HANA innovations.
Harmonized data models and shared master data through consolidation.
Carve out of single entities of the company to SAP BW/4HANA and leverage process simplification.
The best source for more details about all these conversion paths is the Conversion Guide on the SAP Help portal for SAP BW/4HANA http://help.sap.com/bw4hana.