How To Fix R8657 - Key change on DataSource &1 was applied

SAP Error Message - Details

• Message type: E = Error

• Message class: R8 - Messages from the meta data generation

• Message number: 657

• Message text: Key change on DataSource &1 was applied

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message R8657 - Key change on DataSource &1 was applied ?

  The SAP error message R8657 indicates that a key change has been applied to a DataSource, which can lead to issues in data extraction or data consistency. This message typically arises in the context of SAP BW (Business Warehouse) or SAP Data Services when there are changes made to the structure of a DataSource, such as changes to the key fields.
  Cause:
  
  Key Field Changes: The primary cause of this error is that the key fields of the DataSource have been modified. This could happen due to changes in the underlying source system or adjustments made in the DataSource configuration.
  Data Inconsistency: If the key fields are changed, it can lead to inconsistencies in the data being extracted, as the system may not be able to match records correctly.
  DataSource Activation: The error may also occur during the activation of the DataSource after changes have been made.
  
  Solution:
  
  Review Changes: Check the changes made to the DataSource. Ensure that the key fields are correctly defined and that any changes are intentional and necessary.
  Re-activate DataSource: After reviewing the changes, re-activate the DataSource in the SAP BW system. This can often resolve the issue by ensuring that the DataSource is aligned with the current structure.
  Update Data Models: If the DataSource is used in any data models, queries, or transformations, ensure that these are updated to reflect the changes in the key fields.
  Data Consistency Check: Perform a consistency check on the data to ensure that there are no discrepancies caused by the key changes. This may involve running specific reports or transactions in SAP BW.
  Consult Documentation: Refer to SAP documentation or notes related to the specific DataSource and the changes made. There may be specific guidelines or best practices to follow.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error message.
  DataSource Documentation: Review the documentation for the specific DataSource to understand its structure and any dependencies that may be affected by key changes.
  SAP Community: Engage with the SAP Community forums or support channels for additional help and to see if others have encountered similar issues.
  
  If the problem persists after following these steps, it may be necessary to involve SAP support for further investigation and resolution.