|What is tcode SE91 used for?
SE91 is used for Message Maintenance and Report used to generate SE91 is: RSMESSAGES
Messages allow you to communicate with users from your programs. They are mainly used when the user has made an invalid entry on a screen.
To send messages from a program, you must link it to a message class. Each message class has an ID, and usually contains a whole set of message. Each message has a single line of text, and may contain placeholders for variables.
All messages are stored in table T100. You create and edit them using Transaction SE91. Once you have created a message, you can use it in the MESSAGE statement in a program.
Starting the Message Maintenance Transaction
1. Using forward navigation from the ABAP Editor.
2. You can display the messages for your program from the ABAP Editor by choosing Goto -> Messages. The Maintain Messages screen appears. By default, the system display the message class linked to the current program.
3. You can also enter Transaction SE91.
If you choose Goto -> Messages from the ABAP Editor and your program does not have a defined message class, the system assumes you want to browse an existing class and prompts you for a message class ID.
SE91 message can help you to trace your error messages by making used of the Where-Used List features.
Personally, I used it quite often when there is an error message coming out from the SAP transaction code.
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