How To Fix W8402 - Invalid line index (&1) accessing internal table

SAP Error Message - Details

• Message type: E = Error

• Message class: W8 - Workflow: Expressions, data flow

• Message number: 402

• Message text: Invalid line index (&1) accessing internal table

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• What is the cause and solution for SAP error message W8402 - Invalid line index (&1) accessing internal table ?

  SAP Error Message:
  
  W8402 Invalid line index (&1) accessing internal table
  
  Cause:
  This warning message occurs when an ABAP program tries to access an internal table using an invalid line index. Specifically, the index used to read or modify the internal table is either:
  
  Less than 1, or  
  Greater than the current number of entries in the internal table.
  
  Since internal tables in ABAP are 1-based indexed, any attempt to access a line outside the valid range triggers this warning.
  
  Explanation:
  
  Internal tables in ABAP are accessed by line numbers starting at 1.
  If you try to read or modify a line using an index that does not exist (e.g., 0 or a number greater than the number of lines), the system raises this warning.
  This usually happens in statements like READ TABLE itab INDEX idx, LOOP AT itab FROM idx TO idx, or when using MODIFY itab INDEX idx.
  
  
  Solution:
  
  
  Check the index value before accessing the internal table:
  
  Ensure the index is within the valid range: 1 <= index <= lines(itab).
  Example:
  IF index >= 1 AND index <= lines(itab).
    READ TABLE itab INDEX index INTO wa.
    " Process wa
  ELSE.
    " Handle invalid index case
  ENDIF.
  
  
  
  
  Use safer access methods:
  
  Instead of using INDEX, consider using READ TABLE with a key if possible.
  Use LOOP AT itab INTO wa WHERE ... to avoid direct index access.
  
  
  
  Debug and analyze the program logic:
  
  Find out why the index is invalid.
  Check if the internal table is empty or smaller than expected.
  Verify if the index variable is correctly calculated or updated.
  
  
  
  Initialize or fill the internal table properly before access:
  
  Make sure the internal table is populated before accessing it by index.
  
  
  
  
  Related Information:
  
  Message Class: W84 (usually related to internal table operations)
  SAP Notes: Check SAP Notes related to internal table handling if this occurs in standard SAP code.
  ABAP Documentation:  
  
  Internal Tables - Accessing Lines  
  READ TABLE Statement
  
  
  
  
  Summary:
  The warning W8402 indicates an attempt to access an internal table line with an invalid index. The solution is to validate the index before access and ensure the internal table is properly populated. Adjust program logic to prevent out-of-range index usage.
  
  If you provide the relevant code snippet, I can help you pinpoint the exact cause and suggest a fix.