How To Fix RSSM_TT038 - DTP &1 is part of a closed loop; it writes back to its source

SAP Error Message - Details

• Message type: E = Error

• Message class: RSSM_TT - Transfer Tool

• Message number: 038

• Message text: DTP &1 is part of a closed loop; it writes back to its source

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSSM_TT038 - DTP &1 is part of a closed loop; it writes back to its source ?

  The SAP error message RSSM_TT038 indicates that a Data Transfer Process (DTP) is part of a closed loop, meaning that it is configured to write back to its source. This situation can lead to data inconsistencies and is generally not allowed in SAP BW (Business Warehouse) because it can create circular data flows.
  Cause:
  The error occurs when:
  
  A DTP is set up to extract data from a target (like an InfoProvider) and then write it back to the same or a related source. This creates a loop where the data being written back could potentially be read again in the next extraction cycle, leading to infinite loops or data corruption.
  The DTP is incorrectly configured, or the data flow design does not adhere to best practices.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review DTP Configuration:
  
  Check the DTP settings to ensure that it is not configured to write back to its source. If it is, you need to change the target of the DTP to a different InfoProvider that does not create a closed loop.
  
  
  
  Change Data Flow Design:
  
  Reassess the data flow design. Ensure that the DTP is part of a linear flow where data is extracted from a source, transformed if necessary, and loaded into a target without writing back to the source.
  
  
  
  Use Separate DTPs:
  
  If you need to perform write-back operations, consider using separate DTPs for extraction and loading. This way, you can manage the data flow without creating a closed loop.
  
  
  
  Check for Process Chains:
  
  If the DTP is part of a process chain, ensure that the process chain does not inadvertently create a loop. Review the sequence of data flows and adjust as necessary.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or guidelines on DTP configurations and best practices to ensure compliance with recommended data flow designs.
  
  
  
  Testing:
  
  After making changes, test the DTP to ensure that it runs successfully without errors.
  
  
  
  Related Information:
  
  SAP BW Best Practices: Familiarize yourself with best practices for data modeling and data flow design in SAP BW to avoid similar issues in the future.
  SAP Notes: Check for any relevant SAP Notes that might provide additional insights or updates related to this error message.
  SAP Community: Engage with the SAP Community forums for discussions and solutions shared by other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the RSSM_TT038 error and ensure that your DTPs are configured correctly without creating closed loops.