How To Fix SEG021 - The read function does not exist or has the wrong signature

SEG021 - Overview

• Message type: E = Error

• Message class: SEG - Code Page Segments

• Message number: 021

• Message text: The read function does not exist or has the wrong signature

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SEG021 - The read function does not exist or has the wrong signature ?

  The SAP error message SEG021 indicates that there is an issue with a read function in your ABAP program or function module. This error typically arises when the system cannot find the specified read function, or the function exists but has an incorrect signature (i.e., the parameters do not match what is expected).
  Causes of SEG021
  
  Function Module Not Found: The specified function module does not exist in the system.
  Incorrect Function Signature: The parameters defined in the function module do not match the parameters being passed in the call.
  Authorization Issues: The user may not have the necessary authorizations to access the function module.
  Transport Issues: If the function module was recently transported, it may not have been activated properly in the target system.
  Namespace Issues: The function module might be in a different namespace or package that is not accessible.
  
  Solutions to SEG021
  
  
  Check Function Module Existence:
  
  Use transaction SE37 or SE80 to check if the function