How To Fix SWDC125 - LOOP at dbtab. MODIFY dbtab. ENDLOOP.

SAP Error Message - Details

• Message type: E = Error

• Message class: SWDC - Web Dynpro: Conversion

• Message number: 125

• Message text: LOOP at dbtab. MODIFY dbtab. ENDLOOP.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SWDC125 - LOOP at dbtab. MODIFY dbtab. ENDLOOP. ?

  The SAP error message SWDC125 "LOOP at dbtab. MODIFY dbtab. ENDLOOP." typically indicates that there is an issue with a loop in an ABAP program that is trying to modify a database table while iterating over it. This can lead to inconsistencies or unexpected behavior, as modifying a table while looping through it can cause the loop to behave unpredictably.
  Cause:
  
  
  Modification During Loop: The most common cause of this error is that the program is attempting to modify a database table (using MODIFY) while it is still in a LOOP statement that is iterating over that same table. This can lead to a situation where the loop's internal pointer becomes invalid or the data set changes unexpectedly.
  
  
  Concurrency Issues: If multiple processes are trying to modify the same data simultaneously, it can lead to locking issues or inconsistencies.
  
  
  Incorrect Logic: There may be logical errors in the code that lead to unintended modifications during the loop.
  
  
  Solution:
  
  
  Avoid Modifying the Table in the Loop: Instead of modifying the database table directly within the loop, consider collecting the changes in an internal table and then applying those changes after the loop has completed. For example:
  DATA: lt_changes TYPE TABLE OF your_table_type,
        ls_change TYPE your_table_type.
  
  LOOP AT it_table INTO ls_table.
      " Prepare changes
      ls_change = ls_table.
      " Modify the fields as needed
      APPEND ls_change TO lt_changes.
  ENDLOOP.
  
  " Now modify the database table outside the loop
  MODIFY your_table FROM TABLE lt_changes.
  
  
  Use a Temporary Table: If you need to perform complex modifications, consider using a temporary internal table to store the results of your loop and then perform the modifications in a separate step.
  
  
  Check for Locks: Ensure that there are no locking issues with the database table. You can use transaction codes like SM12 to check for locks.
  
  
  Review Code Logic: Go through the code to ensure that the logic is correct and that there are no unintended modifications happening during the loop.
  
  
  Related Information:
  
  ABAP Documentation: Review the ABAP documentation for best practices on looping and modifying database tables.
  Performance Considerations: Modifying a database table in a loop can lead to performance issues. It's generally better to minimize database writes by batching changes.
  Debugging: Use the ABAP debugger to step through the code and observe the behavior of the loop and the modifications being made.
  
  By following these guidelines, you should be able to resolve the SWDC125 error and ensure that your ABAP program runs smoothly without encountering issues related to modifying database tables during a loop.