T-Code Naming convention in SAP

The T-Code also called as Transaction Code in SAP has different meaning that depends on the functionality of application and few are customized one according to requirement. There are few standard T-Codes which remains same for most of the applications. example:

Standard T-Code:

SE16

SM37

Customizes T-Codes like:

ZR01

In the above T-Code
SE : System Engineering,
SM : System Maintenance.
The last two numbers assigned in T-Codes are assigned for editing, view, creation, display etc..

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