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

W8402 - Overview

• Message type: E = Error

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

• Message number: 402

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

Self-Explanatory Message

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Smart SAP Assistant

• 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