How To Fix DMU426 - Return to function module &1 (transaction &2)

SAP Error Message - Details

• Message type: E = Error

• Message class: DMU - Digital Mock Up (DMU)

• Message number: 426

• Message text: Return to function module &1 (transaction &2)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMU426 - Return to function module &1 (transaction &2) ?

  The SAP error message DMU426, which states "Return to function module &1 (transaction &2)," typically occurs in the context of data migration or data transfer processes, particularly when using the Data Migration Workbench (DMW) or similar tools. This error indicates that there was an issue with the execution of a function module during a transaction.
  Cause:
  
  Function Module Error: The function module specified in the error message encountered an issue, which could be due to incorrect parameters, data inconsistencies, or other runtime errors.
  Transaction Issues: The transaction specified may not have been executed correctly, possibly due to missing prerequisites or incorrect configuration.
  Data Issues: There may be issues with the data being processed, such as missing mandatory fields, incorrect data types, or data that violates business rules.
  Authorization Issues: The user executing the transaction may not have the necessary authorizations to perform the action.
  
  Solution:
  
  Check Function Module: Review the function module mentioned in the error message. You can do this by using transaction SE37 to analyze the function module's code and see if there are any obvious issues.
  Review Transaction: Check the transaction specified in the error message. Ensure that all required fields are filled out correctly and that the transaction is being executed in the correct context.
  Data Validation: Validate the data being processed. Ensure that all mandatory fields are populated and that the data adheres to the expected formats and business rules.
  Authorization Check: Verify that the user has the necessary authorizations to execute the function module and transaction. You can check this using transaction SU53 to see if there were any authorization failures.
  Debugging: If the issue persists, consider debugging the function module to identify the exact point of failure. You can set breakpoints in the function module to analyze the flow of data and identify where the error occurs.
  Consult Documentation: Refer to SAP documentation or notes related to the specific function module or transaction for any known issues or additional troubleshooting steps.
  
  Related Information:
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional context.
  Transaction Codes: Familiarize yourself with related transaction codes that may help in troubleshooting, such as SE37 (Function Builder), SE80 (Object Navigator), and ST22 (Dump Analysis).
  Community Forums: Consider searching or posting on SAP community forums or platforms like SAP Community, Stack Overflow, or other SAP-related discussion boards for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to diagnose and resolve the DMU426 error effectively.