How To Fix UR491 - Delta BW extraction of transaction data cannot be restarted

SAP Error Message - Details

• Message type: E = Error

• Message class: UR -

• Message number: 491

• Message text: Delta BW extraction of transaction data cannot be restarted

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UR491 - Delta BW extraction of transaction data cannot be restarted ?

  The SAP error message UR491 indicates that a delta extraction for a BW (Business Warehouse) data source cannot be restarted. This typically occurs in the context of data extraction from SAP ERP systems to SAP BW, particularly when dealing with delta loads of transaction data.
  Cause:
  The error can be caused by several factors, including:
  
  Delta Queue Issues: The delta queue may be in an inconsistent state, or there may be issues with the delta management in the source system.
  Data Consistency: If there are inconsistencies in the data or if the data has been modified in a way that affects the delta extraction process, it can lead to this error.
  Technical Issues: There may be technical issues with the data source or the extraction process itself, such as missing or corrupted data.
  Locking Issues: If the data being extracted is locked by another process, it can prevent the delta extraction from being restarted.
  Configuration Issues: Incorrect configuration of the data source or the delta process can also lead to this error.
  
  Solution:
  To resolve the UR491 error, you can follow these steps:
  
  
  Check Delta Queue: 
  
  Use transaction code RSA7 to check the delta queue. Ensure that there are no inconsistencies or errors in the delta queue.
  If there are entries in the delta queue that are not being processed, you may need to delete or reprocess them.
  
  
  
  Reinitialize Delta:
  
  If the delta extraction cannot be restarted, you may need to reinitialize the delta process. This involves performing a full load of the data source and then setting up the delta extraction again.
  Use transaction code RSA1 to manage the data source and perform the reinitialization.
  
  
  
  Check for Locks:
  
  Ensure that there are no locks on the data being extracted. You can use transaction code SM12 to check for and remove any locks that may be causing the issue.
  
  
  
  Review Logs:
  
  Check the logs for any additional error messages or warnings that may provide more context about the issue. You can use transaction codes like SLG1 to view application logs.
  
  
  
  Consult Documentation:
  
  Review SAP notes and documentation related to the specific data source and delta extraction process. There may be specific recommendations or patches available.
  
  
  
  Contact SAP Support:
  
  If the issue persists after trying the above steps, consider reaching out to SAP support for further assistance. They may have additional insights or solutions based on the specific circumstances of your system.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  RSA7 - Delta Queue Monitor
  RSA1 - Data Warehousing Workbench
  SM12 - Lock Entries
  SLG1 - Application Log
  
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address known issues related to delta extraction and the UR491 error.
  
  
  Documentation: Review the SAP BW documentation for best practices on delta extraction and troubleshooting common issues.
  
  
  By following these steps, you should be able to diagnose and resolve the UR491 error in your SAP BW extraction process.