How To Fix RSDME781 - Source &2 of Model &1 is already attached to BW DataSource &3

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDME -

• Message number: 781

• Message text: Source &2 of Model &1 is already attached to BW DataSource &3

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDME781 - Source &2 of Model &1 is already attached to BW DataSource &3 ?

  The SAP error message RSDME781 indicates that there is an issue with the attachment of a source to a BW (Business Warehouse) DataSource. Specifically, it means that the source object (like a table or view) is already linked to another BW DataSource, which prevents it from being attached to the DataSource you are trying to create or modify.
  Cause:
  
  Duplicate Attachment: The source object (e.g., a database table or view) is already associated with a different BW DataSource.
  Modeling Conflicts: There may be a conflict in the data model where the same source is being used in multiple places, leading to this error when trying to attach it to a new DataSource.
  
  Solution:
  
  
  Check Existing Attachments:
  
  Go to the Data Warehousing Workbench (transaction RSA1).
  Navigate to the DataSources and check if the source object is already attached to another DataSource.
  If it is, you may need to decide whether to use the existing DataSource or create a new one with a different source.
  
  
  
  Detach the Source:
  
  If you need to use the source in a new DataSource, you can detach it from the existing DataSource (if applicable) and then attach it to the new one. Be cautious with this approach, as it may affect existing reports or processes that rely on the original DataSource.
  
  
  
  Create a New Source:
  
  If the source must remain attached to the existing DataSource, consider creating a new source object (e.g., a copy of the table or view) that can be used for the new DataSource.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or notes related to DataSource modeling to ensure compliance with best practices.
  
  
  
  Check for Locks:
  
  Sometimes, the source might be locked due to ongoing processes. Ensure that no other processes are using the source when you attempt to attach it.
  
  
  
  Related Information:
  
  Transaction Codes: Use transaction RSA1 for Data Warehousing Workbench and RSA3 for testing DataSources.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues or provide additional guidance on this error.
  DataSource Management: Familiarize yourself with the DataSource management in BW, including how to create, modify, and delete DataSources.
  
  By following these steps, you should be able to resolve the RSDME781 error and successfully manage your BW DataSources.