Messages and User-Friendly Error Handling

Explanation

Messages are used to communicate errors, warnings, success and information to users. In ABAP, messages are usually maintained in message classes and raised using MESSAGE statements. Good messages help business users correct input. Bad messages confuse users or expose technical details. In reports and validations, use meaningful messages such as 'Company code is required' instead of short dumps or technical failures. In BAPI and interface scenarios, collect messages into return tables and display or log them clearly.

Code example

IF p_bukrs IS INITIAL.  MESSAGE 'Company code is required' TYPE 'E'.ENDIF. APPEND VALUE #( type = 'E'                message = 'Material is missing in upload row' ) TO lt_return.

Real project scenario

A sales upload program validates customer, material and quantity. Instead of stopping at the first technical error, it collects all row-level messages and shows them in an ALV error log.

Common mistakes

- Showing technical messages to business users. - Stopping processing without showing row-level errors. - Hardcoding too many messages in code. - Not collecting BAPI return messages properly.

Best practices

- Use clear user-friendly messages. - Collect row-level messages in upload/interface programs. - Use message classes for reusable messages. - Do not hide important errors.

Interview angle

Interviewers may ask how you handle validation errors in upload programs or BAPI processing.