What is a transaction code (T-code) in SAP?

A transaction code is a short alphanumeric shortcut (like VA01 for creating a sales order, or SE38 for the ABAP editor) that takes you directly to a specific SAP function or screen, without needing to navigate through menus manually.

//  typed into the SAP GUI's command field:
/nVA01     // creates a new sales order, ending any current transaction first
/oMM01     // opens material master creation in a new session

T-codes are the primary way experienced SAP users navigate the system quickly, and they're specific to whatever function they represent — some are standard, delivered by SAP, while custom transaction codes can also be created for custom-developed programs. The /n and /o prefixes control whether the new transaction replaces the current session or opens an additional one.

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