How To Fix ABAP_TESTDOUBLE012 - &4 Setting of values not allowed as iterator is active

SAP Error Message - Details

• Message type: E = Error

• Message class: ABAP_TESTDOUBLE -

• Message number: 012

• Message text: &4 Setting of values not allowed as iterator is active

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ABAP_TESTDOUBLE012 - &4 Setting of values not allowed as iterator is active ?

  The SAP error message ABAP_TESTDOUBLE012 with the text "Setting of values not allowed as iterator is active" typically occurs in ABAP programs when you attempt to modify a table or internal table while an iterator is active. This is a common issue when using loops or iterators to process data.
  Cause:
  The error arises because the ABAP runtime environment does not allow modifications to the internal table while it is being iterated over. This is to prevent inconsistencies and unexpected behavior during the iteration process. The iterator maintains a pointer to the current position in the table, and changing the table while iterating can lead to errors or undefined behavior.
  Solution:
  To resolve this error, you can follow these approaches:
  
  
  Avoid Modifying the Table During Iteration:
  
  If you need to modify the table, consider collecting the changes in a separate internal table or a list and apply those changes after the iteration is complete.
  
  DATA: lt_table TYPE TABLE OF your_table_type,
        lt_changes TYPE TABLE OF your_table_type.
  
  LOOP AT lt_table INTO DATA(ls_row).
    " Collect changes instead of modifying directly
    IF condition_to_modify.
      ls_row-field = new_value.
      APPEND ls_row TO lt_changes.
    ENDIF.
  ENDLOOP.
  
  " Now apply changes to the original table
  LOOP AT lt_changes INTO DATA(ls_change).
    MODIFY lt_table FROM ls_change.
  ENDLOOP.
  
  
  Use a Different Approach:
  
  If you need to delete or add entries, consider using a different approach, such as creating a new internal table with the desired entries and then replacing the original table after the iteration.
  
  
  
  Use a Temporary Table:
  
  If you need to perform complex operations that require modifying the table, consider using a temporary table to hold the results of your operations and then replace the original table after the loop.
  
  
  
  Related Information:
  
  ABAP Iterators: Understand how iterators work in ABAP. They are used to traverse internal tables without needing to manage the index manually.
  Performance Considerations: Modifying tables during iteration can lead to performance issues, so it's generally a good practice to avoid this pattern.
  Debugging: If you encounter this error, check the code where the iteration is happening and ensure that no modifications are being made to the table being iterated over.
  
  By following these guidelines, you should be able to resolve the ABAP error message ABAP_TESTDOUBLE012 effectively.