What is a client in the SAP system?

Can someone explain to me what a client is in an SAP NetWeaver system that uses the ABAP stack, and how does it create logical partitions within the same installation?

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One SAP system can be used for several independent companies (or company subsidiaries). The client is used to separate data from these companies. Therefore, most database tables in the SAP system have a customer key. This is used, for example, for transaction data, master data, and customer-specific setup data. However, there is also a setting that is valid for all clients (the so-called cross-client setting).

In short: The customer is a key field in most database tables for sharing data from multiple companies using the same SAP system. Each company has its own customer number.

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In addition to responding to Christian Trebing, there are a few more important points.

  1. Users are registered in the client. Each client has separate users and authentication.

  2. As a rule, the entire database operation in a table that has a "client" field, the code does not require a client. The system is already taking care of it.

Most standard processes (business transactions / external communications, etc.) are already configured specifically for the client and are performed in this way.

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