How To Fix UR157 - An init. or delta request is already running for this DataSource

SAP Error Message - Details

• Message type: E = Error

• Message class: UR -

• Message number: 157

• Message text: An init. or delta request is already running for this DataSource

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UR157 - An init. or delta request is already running for this DataSource ?

  The SAP error message UR157 indicates that an initialization or delta request is already running for a specific DataSource. This typically occurs in the context of SAP BW (Business Warehouse) or SAP Data Services when trying to load data from a source system into the BW system.
  Cause:
  
  
  Concurrent Requests: The error usually arises when there is an attempt to start a new data load (initialization or delta) for a DataSource that is already being processed. This can happen if:
  
  A previous data load is still in progress.
  A previous request has not completed or has been stuck due to some issue.
  Multiple processes are trying to load data simultaneously for the same DataSource.
  
  
  
  Long Running Processes: Sometimes, the previous request may take longer than expected due to large volumes of data, network issues, or performance bottlenecks.
  
  
  System Configuration: The system may be configured to allow only one request at a time for a specific DataSource.
  
  
  Solution:
  
  
  Check Running Requests: 
  
  Go to the SAP BW system and check the status of the data load requests. You can do this using transaction codes like RSA1 (Data Warehousing Workbench) or SM37 (Job Monitoring).
  Look for any active requests for the DataSource in question.
  
  
  
  Wait for Completion: If a request is currently running, you may need to wait for it to complete before starting a new one.
  
  
  Terminate Stuck Requests: If you find that a request is stuck or taking too long, you can terminate it:
  
  Use transaction SM37 to find the job and cancel it if necessary.
  Ensure that you have the necessary authorizations to terminate jobs.
  
  
  
  Check for Locks: Sometimes, locks can cause this issue. You can check for locks using transaction SM12 and release any locks that are no longer needed.
  
  
  Review DataSource Configuration: Ensure that the DataSource is configured correctly and that there are no settings that would prevent concurrent requests.
  
  
  Monitor System Performance: If this issue occurs frequently, consider monitoring system performance and optimizing data load processes to prevent long-running requests.
  
  
  Related Information:
  
  
  Transaction Codes:
  
  RSA1: Data Warehousing Workbench
  SM37: Job Monitoring
  SM12: Lock Entries
  RSMO: Monitor Data Load
  
  
  
  Best Practices:
  
  Schedule data loads during off-peak hours to minimize the chance of overlapping requests.
  Implement error handling and monitoring to catch issues early.
  Regularly review and optimize data load processes to improve performance.
  
  
  
  By following these steps, you should be able to resolve the UR157 error and ensure smooth data loading processes in your SAP BW environment.