The messages in the R/3 System can be classified according to different types. The message type determines where the message is issued and how the system responds. A message can have five different types. These message types have the following effects during list processing:
S Message (Success)
S-type messages are displayed in the Status Bar on the same or next screen. The message has no influence on the user's work. It only confirms the successful execution of system functions.
A Message (Abend):
The system displays a message of this message type in a dialog window. After the user confirms the message using ENTER, the system terminates the entire transaction (for example SE38). A messages do not allow the user to make any further entries. The user can only acknowledge the message. The task is abruptly terminated and the system returns to a higher-level menu.
A messages should only be issued in extraordinary circumstances, for example, when a system-related error occurs or if the error can no longer be handled by the task. In all error situations handled by the task, however, it should be possible for the user to remain in his work environment. A messages should therefore be avoided, if possible.
W Message (Warning)
W messages interrupt the processing and allow the user to make corrections. For this reason, fields are enabled for input. W messages are displayed in the Status Bar if the messages have been issued by a primary window. If a dialog box issues the message, the system displays the message in a separate dialog box.
With regard to the system response, warnings are similar to E messages. E messages, however, force the user to change the entry.
E Message (Error)
When the system detects an error, E messages should be used. Incorrectly completed fields must be ready for input. If consequential errors occur, we recommend to make not only the incorrectly filled field ready for input but also those fields whose entries have contributed to the error.
Depending on whether the E message was issued by a primary window or a dialog box, it is either displayed in the Status Bar of the primary window or in a separate dialog box.
I Message (Information): The system displays a message of this message type in a dialog window. After the user chooses ENTER , the system resumes processing at the current program position.