How To Fix 0K657 - Avoid callback BEFORE_LINE_OUTPUT

0K657 - Overview

• Message type: E = Error

• Message class: 0K - Messages for "General List Modules"

• Message number: 657

• Message text: Avoid callback BEFORE_LINE_OUTPUT

Self-Explanatory Message

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0K657 - Details

• The SAP error message 0K657: Avoid callback BEFORE_LINE_OUTPUT typically occurs in the context of ABAP programming, particularly when dealing with ALV (ABAP List Viewer) reports or similar output scenarios. This error indicates that there is an issue with the sequence of events in the output processing of the report.
  
  Cause:
  The error is generally caused by the following situations:
  
  Improper Use of Callbacks: The callback method BEFORE_LINE_OUTPUT is being called inappropriately or at a time when it should not be executed. This can happen if the logic in your report or module pool is not correctly structured.
  Incorrect Event Handling: The event handling for the ALV output is not set up correctly, leading to the callback being triggered at an unexpected time.
  Multiple Callbacks: If there are multiple callbacks defined and they are conflicting with each other, it can lead to this error.
  
  
  Solution:
  To resolve the error, consider the following steps:
  
  
  Review Callback Implementation: Check the implementation