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.

Messages which refer to errors, so-called error messages, can be grouped in terms of their contents on the basis of the events triggering them or the objects affected. Error messages are to state the problem and, if space permits, should offer suggestions for removing the error. In this way the user can proceed without outside help. Examples illustrate the individual error groups.