How To Fix /SAPPO/MSG326 - &1 is not a valid function module for the detail screen

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPPO/MSG -

• Message number: 326

• Message text: &1 is not a valid function module for the detail screen

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 /SAPPO/MSG326 - &1 is not a valid function module for the detail screen ?

  The SAP error message /SAPPO/MSG326 &1 is not a valid function module for the detail screen typically indicates that the system is trying to call a function module that does not exist or is not correctly defined in the system. This error is often encountered in the context of custom developments or enhancements in SAP, particularly when dealing with custom function modules or when integrating with other systems.
  Causes:
  
  Non-existent Function Module: The function module specified in the error message does not exist in the SAP system.
  Incorrect Configuration: The configuration settings for the application or module may be pointing to an incorrect or outdated function module.
  Authorization Issues: The user may not have the necessary authorizations to access the specified function module.
  Transport Issues: If the function module was recently transported from another system, it may not have been transported correctly or may be missing dependencies.
  Custom Development: If the function module is custom-developed, it may not have been activated or may contain errors.
  
  Solutions:
  
  
  Check Function Module Existence:
  
  Use transaction code SE37 to check if the function module exists in the system. If it does not exist, you may need to create it or correct the configuration that references it.
  
  
  
  Review Configuration:
  
  Check the configuration settings in the relevant application area to ensure that the correct function module is being referenced. This may involve looking at customizing settings in SPRO or other relevant transactions.
  
  
  
  Authorization Check:
  
  Ensure that the user has the necessary authorizations to execute the function module. You can check this using transaction SU53 after the error occurs.
  
  
  
  Transport Check:
  
  If the function module was recently transported, verify that the transport was successful and that all dependencies were included. You can check the transport logs for any errors.
  
  
  
  Debugging:
  
  If you have access to the development environment, you can debug the program or transaction that is generating the error to identify where the invalid function module is being called.
  
  
  
  Consult Documentation:
  
  If the function module is part of a standard SAP application, consult the SAP documentation or support notes for any known issues or updates related to the function module.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support for assistance, especially if this is a production issue.
  
  
  
  Related Information:
  
  Transaction Codes: SE37 (Function Builder), SE80 (Object Navigator), SU53 (Authorization Check), SPRO (Customizing).
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error message or provide guidance on similar issues.
  Custom Development: If the function module is custom, ensure that it is properly developed, tested, and activated in the system.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution.