How To Fix RSDS121 - There still seems to be data in the PSA despite 'No data found' error

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDS - New DataSource

• Message number: 121

• Message text: There still seems to be data in the PSA despite 'No data found' error

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDS121 - There still seems to be data in the PSA despite 'No data found' error ?

  The SAP error message RSDS121 indicates that there is still data present in the Persistent Staging Area (PSA) despite the system reporting a "No data found" error. This can occur in the context of data extraction processes, particularly when working with SAP BW (Business Warehouse) or SAP BW/4HANA.
  Cause:
  
  Data Load Issues: The error may arise if there was an issue during the data load process, leading to incomplete or inconsistent data in the PSA.
  Data Deletion: If data was deleted from the PSA after the last successful load, the system might still reference the old state, causing confusion.
  Data Source Configuration: Misconfiguration of the data source or transformation rules can lead to discrepancies in data availability.
  Data Transfer Process (DTP) Issues: Problems with the DTP settings or execution can also lead to this error.
  Buffer Issues: Sometimes, the system might not have updated its buffer correctly, leading to a mismatch between the actual data in the PSA and what the system reports.
  
  Solution:
  
  Check PSA Contents: Use transaction code RSA1 to access the Data Warehousing Workbench and check the contents of the PSA. Ensure that there is indeed data present.
  Re-run Data Load: If the data is missing or incomplete, try re-running the data load process to refresh the data in the PSA.
  Check DTP Settings: Review the settings of the Data Transfer Process (DTP) to ensure that they are correctly configured and that there are no filters or transformations that might be excluding data.
  Clear Buffer: If you suspect a buffer issue, you can clear the buffer for the relevant data source or DTP. This can sometimes resolve discrepancies.
  Check for Errors in Logs: Review the logs for any errors or warnings that occurred during the data load process. This can provide insights into what went wrong.
  Data Source Configuration: Ensure that the data source is correctly configured and that there are no issues with the extraction logic.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  
  Related Information:
  
  PSA (Persistent Staging Area): The PSA is a temporary storage area in SAP BW where data is stored before it is transformed and loaded into the data warehouse. It is crucial for troubleshooting data load issues.
  Data Transfer Process (DTP): DTP is a process in SAP BW that defines how data is transferred from the source to the target (e.g., from PSA to InfoProviders).
  Transaction Codes: Familiarize yourself with relevant transaction codes such as RSA1 (Data Warehousing Workbench), RSMO (Monitor Data Loads), and RSPC (Process Chain) for monitoring and managing data loads.
  
  By following these steps, you should be able to identify the cause of the RSDS121 error and implement a solution to resolve it.