How To Fix R8256 - DataSource &1 has an inconsistent key info. &3 for field &2

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 256

• Message text: DataSource &1 has an inconsistent key info. &3 for field &2

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message R8256 - DataSource &1 has an inconsistent key info. &3 for field &2 ?

  The SAP error message R8256 indicates that there is an inconsistency in the key information for a DataSource. This typically occurs when the DataSource is not properly defined or when there are discrepancies in the key fields that are expected versus what is actually present in the DataSource.
  Cause:
  
  Inconsistent Key Fields: The key fields defined in the DataSource do not match the actual data structure or the data being extracted.
  Changes in Data Structure: If the underlying data structure of the source system has changed (e.g., fields added, removed, or renamed), it can lead to inconsistencies.
  Incorrect DataSource Configuration: The DataSource may not be configured correctly in terms of the key fields.
  Transport Issues: If the DataSource was transported from one system to another, there may be inconsistencies due to missing or incorrect transport settings.
  
  Solution:
  
  
  Check DataSource Configuration:
  
  Go to the DataSource in the SAP system (transaction code RSA1).
  Verify the key fields defined in the DataSource and ensure they match the source system's data structure.
  
  
  
  Adjust Key Fields:
  
  If there are discrepancies, adjust the key fields in the DataSource configuration to align with the source data structure.
  
  
  
  Recreate DataSource:
  
  If the DataSource is significantly misconfigured, consider deleting and recreating it to ensure it is set up correctly.
  
  
  
  Check for Changes in Source System:
  
  Investigate if there have been any recent changes in the source system that could have affected the DataSource. If so, update the DataSource accordingly.
  
  
  
  Transport Check:
  
  If the DataSource was transported, ensure that all necessary objects and configurations were included in the transport request.
  
  
  
  Testing:
  
  After making changes, test the DataSource to ensure that it is functioning correctly and that the error message no longer appears.
  
  
  
  Related Information:
  
  Transaction Codes: Use RSA1 for DataSource management and RSMO for monitoring data loads.
  SAP Notes: Check SAP Notes related to DataSource issues for any known bugs or additional guidance.
  Documentation: Refer to SAP documentation for detailed information on DataSource configuration and troubleshooting.
  
  By following these steps, you should be able to resolve the R8256 error and ensure that your DataSource is correctly configured.