How To Fix RD157 - An init or delta request is already running for this DataSource

SAP Error Message - Details

• Message type: E = Error

• Message class: RD - CO-PA Connection to SAP BW

• 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 RD157 - An init or delta request is already running for this DataSource ?

  The SAP error message RD157 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) when trying to load data from a source system into the BW system, and it can prevent new data loads from being initiated for that DataSource until the current process is completed.
  Cause:
  
  
  Concurrent Requests: The most common cause of this error is that there is already an active initialization or delta load process for the same DataSource. This can happen if:
  
  A previous data load is still in progress.
  A previous load has not been properly terminated or has hung.
  Multiple processes are trying to load data simultaneously for the same DataSource.
  
  
  
  System Locking: The system may have a locking mechanism that prevents multiple requests from being processed at the same time for the same DataSource.
  
  
  Solution:
  
  
  Check Active Requests:
  
  Go to the transaction code RSA1 (Data Warehousing Workbench) and navigate to the "Monitor" section to check for any active requests for the DataSource in question.
  You can also use transaction SM37 to view job logs and see if there are any jobs currently running that are related to the DataSource.
  
  
  
  Terminate Hanging Processes:
  
  If you find that a process is stuck or has hung, you may need to terminate it. You can do this from SM37 by selecting the job and choosing to cancel it.
  
  
  
  Wait for Completion:
  
  If there is a legitimate process running, you may need to wait for it to complete before starting a new load.
  
  
  
  Check for Locks:
  
  Use transaction SM12 to check for any locks related to the DataSource. If you find any locks that are no longer needed, you can delete them.
  
  
  
  Review Logs:
  
  Check the logs for the previous data load to identify any issues that may have caused it to hang or take longer than expected.
  
  
  
  Re-run the Load:
  
  Once you have ensured that no other requests are running, you can attempt to re-run the initialization or delta load.
  
  
  
  Related Information:
  
  DataSource: A DataSource in SAP BW is a structure that defines how data is extracted from a source system.
  Initialization Request: This is the first load of data from the source system to the BW system, which sets up the initial data.
  Delta Request: This is used to load only the changes (new or updated records) from the source system after the initial load has been completed.
  Monitoring Tools: Familiarize yourself with monitoring tools in SAP BW, such as RSA1, SM37, and SM12, to effectively manage data loads and troubleshoot issues.
  
  By following these steps, you should be able to resolve the RD157 error and successfully load data into your SAP BW system.