How To Fix SADL_GEN_DRFT_MSG066 - Association #TO_COMPOSITION_ROOT in CDS-View &1 is defined multiple times

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GEN_DRFT_MSG - Message for Draft generation

• Message number: 066

• Message text: Association #TO_COMPOSITION_ROOT in CDS-View &1 is defined multiple times

What causes this issue?

The association #TO_COMPOSITION_ROOT is defined multiple times, either
in the local view or via inheritance from an underlying view. Please
check the active annotations in the DDL document (CDS view) in Eclipse
via right click 'Open With -> Active Annotations'.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Define the association #TO_COMPOSITION_ROOT only once.

Procedure for System Administrators

Contact the corresponding developer of the DDL document in case of
errors otherwise no further action is required.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GEN_DRFT_MSG066 - Association #TO_COMPOSITION_ROOT in CDS-View &1 is defined multiple times ?

  The SAP error message SADL_GEN_DRFT_MSG066 indicates that there is a problem with the definition of associations in a Core Data Services (CDS) view. Specifically, it means that the association #TO_COMPOSITION_ROOT is defined multiple times within the same CDS view, which is not allowed.
  Cause:
  The error typically arises from one of the following scenarios:
  
  Duplicate Association Definitions: The same association is defined more than once in the CDS view.
  Inheritance Issues: If the CDS view is inheriting from another view that also defines the same association, it can lead to conflicts.
  Incorrect Annotations: Misconfigured annotations or incorrect usage of association definitions can also lead to this error.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check for Duplicates: Review the CDS view definition to ensure that the association #TO_COMPOSITION_ROOT is defined only once. If you find multiple definitions, remove the duplicates.
  
  
  Review Inherited Views: If your CDS view is inheriting from another view, check the parent view for the same association. If it exists, you may need to adjust your view to avoid redefining it.
  
  
  Use Aliases: If you need to reference the same association multiple times for different purposes, consider using aliases to differentiate them.
  
  
  Annotations: Ensure that the annotations related to the association are correctly defined and do not conflict with other parts of the CDS view.
  
  
  Testing: After making changes, activate the CDS view and test it to ensure that the error is resolved.
  
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) is a framework for defining semantically rich data models in SAP. Understanding how associations work in CDS views is crucial for effective data modeling.
  SAP Documentation: Refer to the official SAP documentation for CDS views and associations for more detailed information on best practices and guidelines.
  SAP Community: Engaging with the SAP Community can provide insights and solutions from other developers who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the error and ensure that your CDS view is correctly defined.