How To Fix RSTRAN859 - Both data flows generate identical target data

SAP Error Message - Details

• Message type: E = Error

• Message class: RSTRAN - Messages for Transformation

• Message number: 859

• Message text: Both data flows generate identical target data

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSTRAN859 - Both data flows generate identical target data ?

  The SAP error message RSTRAN859 indicates that two data flows are generating identical target data in a data transfer process. This typically occurs in the context of data extraction and transformation processes, particularly in SAP BW (Business Warehouse) or SAP HANA environments.
  Cause:
  The error arises when two different data sources or data flows are configured to load data into the same target object (like a DataStore Object or InfoCube) and the data being extracted from these sources is identical. This can happen due to:
  
  Duplicate Data Sources: Two data sources might be pulling the same data from the same underlying tables or systems.
  Incorrect Transformation Logic: The transformation rules applied to the data might not be differentiating the data correctly, leading to identical outputs.
  Data Overlap: The data being extracted might naturally overlap due to the way the data is structured or due to the selection criteria used in the data flows.
  
  Solution:
  To resolve the RSTRAN859 error, you can take the following steps:
  
  
  Review Data Sources: Check the data sources involved in the data flows. Ensure that they are not pulling the same data. If they are, consider consolidating them into a single data flow.
  
  
  Check Transformation Logic: Review the transformation rules applied to each data flow. Ensure that they are set up correctly and that they are not inadvertently producing the same output.
  
  
  Adjust Selection Criteria: If the data sources are meant to pull different data, verify the selection criteria (filters) used in each data flow. Adjust them to ensure that they target distinct datasets.
  
  
  Use Data Flow Monitoring: Utilize SAP BW monitoring tools to analyze the data flows and identify where the overlap is occurring. This can help pinpoint the exact cause of the duplication.
  
  
  Consult Documentation: Refer to SAP documentation or support resources for specific guidance on handling this error in your version of SAP BW or HANA.
  
  
  Testing: After making adjustments, test the data flows to ensure that they now produce distinct target data without generating the error.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered and resolved similar issues.
  Data Modeling Best Practices: Familiarize yourself with best practices in data modeling within SAP BW to avoid such issues in the future.
  
  By following these steps, you should be able to identify the cause of the RSTRAN859 error and implement a solution to resolve it.