How To Fix SADL_GW_DT_SB_UI031 - CDS-Entity '&1' is already part of the tree

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW_DT_SB_UI - Gateway Service Builder UI Integration for SADL

• Message number: 031

• Message text: CDS-Entity '&1' is already part of the tree

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW_DT_SB_UI031 - CDS-Entity '&1' is already part of the tree ?

  The SAP error message SADL_GW_DT_SB_UI031 indicates that there is an issue with the data model in the context of the SAP Gateway and Core Data Services (CDS). Specifically, the error message states that the CDS entity you are trying to work with is already part of the tree, which typically means that there is a duplication or conflict in the data structure being processed.
  Cause:
  
  Duplicate Entity Reference: The error often arises when the same CDS entity is being referenced multiple times in a single request or operation, leading to a conflict in the data model.
  Incorrect Data Model Configuration: There may be an issue with how the data model is configured, such as incorrect associations or joins that lead to the same entity being included multiple times.
  UI Configuration Issues: If you are working with a UI5 application or Fiori app, the configuration of the UI elements may be causing the same entity to be included multiple times in the binding context.
  
  Solution:
  
  Check Entity References: Review the CDS view or entity definition to ensure that you are not inadvertently including the same entity multiple times. Look for joins or associations that might be causing duplication.
  Review UI Configuration: If this error occurs in a UI context, check the XML or JSON configuration of the UI elements to ensure that the same entity is not being bound multiple times.
  Debugging: Use debugging tools to trace the data flow and see where the duplication is occurring. This can help identify the exact point in the code or configuration where the issue arises.
  Simplify the Data Model: If possible, simplify the data model to avoid complex joins or associations that could lead to duplication.
  Consult Documentation: Refer to SAP documentation or community forums for any known issues or updates related to the specific version of SAP you are using.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide patches or updates.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  CDS Documentation: Review the official SAP documentation on Core Data Services to better understand how to structure your entities and avoid duplication.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.