How To Fix CFD_REGISTRY_CHECK461 - Registered association &1 is not unique; used in data source &2 and &3

SAP Error Message - Details

• Message type: E = Error

• Message class: CFD_REGISTRY_CHECK - Custom Fields: Messages for Registry Check

• Message number: 461

• Message text: Registered association &1 is not unique; used in data source &2 and &3

What causes this issue?

You registered association <(>&<)>1, which is not defined locally in
registered CDS View <(>&<)>4 but comes from at least two different data
sources <(>&<)>2 and <(>&<)>3.
All Data Source Extensions for <(>&<)>4 based on this association, would
lead to Syntax Errors in the CDS View Extensions as the association
<(>&<)>1 is not unique for the DDIC activation.

System Response

You cannot register this association<(>,<)> because new Data Source
Extensions would lead to DDIC activation errors and existing Data Source
Extensions would lead to Syntax Errors during Upgrade on customer side!

How to fix this error?

You have the following options:
Rename the association <(>&<)>1 in one of the underlying Data Sources
(e.g. in the joined CDS View). Then the association from the other Data
Source is used which would be then unique again.
Define the association <(>&<)>1 also locally in the registered CDS View
<(>&<)>4 itself and expose it. Then DDIC automatically uses the locally
defined association in the CDS View Extension.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CFD_REGISTRY_CHECK461 - Registered association &1 is not unique; used in data source &2 and &3 ?

  The SAP error message CFD_REGISTRY_CHECK461 indicates that there is a conflict with registered associations in the system. Specifically, it means that the association identified by &1 is not unique because it is being used in two different data sources, &2 and &3. This can lead to ambiguity in data retrieval and processing.
  Cause:
  
  Duplicate Associations: The same association is defined in multiple data sources, which can create confusion for the system when trying to resolve which association to use.
  Modeling Errors: There may be an error in the data model where associations are not properly defined or are overlapping.
  Configuration Issues: Incorrect configuration in the data source definitions can lead to this error.
  
  Solution:
  
  Review Associations: Check the associations defined in the data sources mentioned in the error message. Ensure that each association is unique and correctly defined.
  Modify Data Sources: If the same association is indeed needed in both data sources, consider renaming one of the associations or modifying the data model to avoid the conflict.
  Check for Redundant Definitions: Look for any redundant or unnecessary definitions in your data model that could be causing the overlap.
  Consult Documentation: Refer to SAP documentation or guidelines for best practices in defining associations to avoid such conflicts.
  Testing: After making changes, test the data sources to ensure that the error is resolved and that the associations work as intended.
  
  Related Information:
  
  Data Modeling: Understanding how to properly model data in SAP systems, including the use of associations, is crucial to avoid such errors.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Community Forums: Engage with SAP community forums or support channels for additional insights or similar experiences from other users.
  
  By addressing the uniqueness of the associations and ensuring proper configuration, you should be able to resolve the CFD_REGISTRY_CHECK461 error.