How To Fix WRF_REF421 - Number of parallel tasks successful on first try: &1

SAP Error Message - Details

• Message type: E = Error

• Message class: WRF_REF - Messages from References for Materials Without History

• Message number: 421

• Message text: Number of parallel tasks successful on first try: &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WRF_REF421 - Number of parallel tasks successful on first try: &1 ?

  The SAP error message WRF_REF421, which states "Number of parallel tasks successful on first try: &1," typically occurs in the context of the SAP Retail module, particularly during processes that involve parallel processing of tasks, such as during the execution of mass changes or data uploads.
  Cause:
  The error message WRF_REF421 indicates that the system has attempted to execute a certain number of parallel tasks, but not all of them were successful on the first try. The &1 in the message represents the number of tasks that were successful. This can happen due to various reasons, including:
  
  System Resource Limitations: The system may not have enough resources (CPU, memory) to handle the number of parallel tasks being executed.
  Data Issues: There may be issues with the data being processed, such as invalid entries or data integrity problems.
  Configuration Issues: Incorrect configuration settings in the SAP system or in the specific module being used can lead to failures in task execution.
  Locking Issues: If multiple processes are trying to access the same data simultaneously, it can lead to locking issues, causing some tasks to fail.
  
  Solution:
  To resolve the WRF_REF421 error, you can take the following steps:
  
  
  Check System Resources: Monitor the system's performance and resource usage. If the system is under heavy load, consider scheduling the task during off-peak hours or increasing system resources.
  
  
  Review Data: Validate the data being processed. Look for any inconsistencies or invalid entries that could be causing the tasks to fail. Correct any identified issues.
  
  
  Adjust Parallel Processing Settings: If applicable, review and adjust the settings for parallel processing in the SAP system. This may involve changing the number of parallel tasks that can be executed simultaneously.
  
  
  Check Logs: Review the application logs (transaction SLG1) for more detailed error messages or warnings that can provide insights into why the tasks failed.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to the specific transaction or process you are executing. There may be known issues or patches available.
  
  
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP support for assistance. Provide them with detailed information about the error and the context in which it occurred.
  
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may be using specific transaction codes related to retail processes, such as MASS, WRF_MASS, or others.
  SAP Notes: Check for relevant SAP Notes that may address this specific error or provide guidance on best practices for parallel processing in SAP Retail.
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools to analyze system performance and identify bottlenecks.
  
  By following these steps, you should be able to diagnose and resolve the WRF_REF421 error effectively.