The system landscape contains all the SAP Systems that you have installed. It can consist of several system groups, who’s SAP Systems are linked by transport routes.
After you decide which clients you need and which roles you want them to have, you need to decide how to distribute them amongst the different SAP Systems. You can set up multiple clients independently of one another in a single SAP System. However, when you configure the data, you must remember that cross-client Customizing settings and Repository objects are identical for all clients in a single SAP System. Changes made in one client apply immediately to all clients in the system.
Three-System Landscape:
SAP recommends a three-system landscape in which each of the central clients has its own SAP System.
This consists of a development system DEV, a quality assurance system QAS and a production system PRD. The development system contains the Customizing client CUST, the quality assurance system contains the quality assurance client QTST and the production system contains the production client PROD. Make all changes to Customizing data and Repository objects in the Customizing client. When you release the corresponding change requests, they are transported into the quality assurance client. This means that changes to cross-client data only appear in the quality assurance client after the transport. In the quality assurance client you can test whether the transports are complete, or whether any linked changes are missing and are still in unreleased change requests. If the test is successful, the change requests are transported into the production client. The production client is completely separate from the other clients as regards cross-client data.
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