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ABAP Keyword Documentation → ABAP − Reference → User Dialogs →Messages
Messages are repository objects that are defined using the message editing tool in ABAP Workbench and called by the MESSAGE statement in the ABAP program. The behavior of a message depends on the context in which it was sent. The system interface IF_T100_MESSAGE enables messages to be created for objects and displayed using the statement MESSAGE.
Programming Guideline
Only use messages for error handling in classic dynpros and as exception texts