How To Fix MODEL086 - Header table of instantiated IO class '&1' changed

SAP Error Message - Details

• Message type: E = Error

• Message class: MODEL - Modeling

• Message number: 086

• Message text: Header table of instantiated IO class '&1' changed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MODEL086 - Header table of instantiated IO class '&1' changed ?

  The SAP error message MODEL086 indicates that the header table of an instantiated IO (Input/Output) class has been changed. This typically occurs in the context of SAP's Business Object Processing Framework (BOPF) or similar object-oriented programming scenarios where data consistency is crucial.
  Cause:
  The error usually arises due to one of the following reasons:
  
  Data Modification: The header data of the business object has been modified after it was instantiated, which violates the integrity of the object model.
  Concurrency Issues: Another transaction or user may have changed the header data while your transaction was still processing.
  Incorrect Logic: There may be a logical error in the code that leads to an attempt to access or modify the object after it has been changed.
  
  Solution:
  To resolve the MODEL086 error, consider the following steps:
  
  
  Check for Concurrent Modifications:
  
  Ensure that no other processes or users are modifying the same data simultaneously. Implement proper locking mechanisms if necessary.
  
  
  
  Review Code Logic:
  
  Inspect the code where the error occurs. Ensure that you are not trying to access or modify the object after it has been changed. You may need to refresh the object or re-fetch the data.
  
  
  
  Implement Error Handling:
  
  Add error handling in your code to gracefully manage situations where the data may have changed. This could involve reloading the object or notifying the user.
  
  
  
  Debugging:
  
  Use debugging tools to trace the execution flow and identify where the header data is being modified. This can help pinpoint the exact cause of the issue.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific BOPF or IO class you are working with. There may be specific guidelines or best practices to follow.
  
  
  
  Testing:
  
  After making changes, thoroughly test the application to ensure that the issue is resolved and that no new issues have been introduced.
  
  
  
  Related Information:
  
  BOPF (Business Object Processing Framework): Understand how BOPF works, as it is often the context in which this error occurs. Familiarize yourself with its lifecycle and how it manages data consistency.
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific version of SAP you are using.
  Transaction Logs: Review transaction logs to see if there are any patterns or specific actions that lead to this error.
  
  By following these steps, you should be able to identify the root cause of the MODEL086 error and implement a suitable solution.