How To Fix DD_CDS_ANALYSIS300 - Key Definitions of &1 and &2 are different, &3 is missing in key of &1

SAP Error Message - Details

• Message type: E = Error

• Message class: DD_CDS_ANALYSIS - CDS code inspector messages

• Message number: 300

• Message text: Key Definitions of &1 and &2 are different, &3 is missing in key of &1

What causes this issue?

The explicit defined key of the view &V1& is different than the key of
the underlying data source.

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?

Adjust the key definition of the view by adding the key word KEY at the
appropriated elements.
This warning can be suppressed by putting the pseudo comment
/*+[hideWarning] { "IDS" : [ "KEY_CHECK" ] }*/
in front of the view definition.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DD_CDS_ANALYSIS300 - Key Definitions of &1 and &2 are different, &3 is missing in key of &1 ?

  The SAP error message DD_CDS_ANALYSIS300 indicates that there is a mismatch in the key definitions of two data sources (or CDS views) in your system. Specifically, it suggests that the key definitions for the two entities (&1 and &2) are different, and that a certain field (&3) is missing in the key of the first entity (&1).
  Cause:
  
  Key Definition Mismatch: The key fields defined in the two CDS views or data sources are not aligned. This can happen if one of the views has been modified or if there are inconsistencies in the data model.
  Missing Field: The field (&3) that is expected to be part of the key in the first entity (&1) is not present, which leads to the inconsistency.
  Data Model Changes: Changes in the underlying data model or database tables that are not reflected in the CDS views can also lead to this error.
  
  Solution:
  
  Check Key Definitions: Review the key definitions of both entities (&1 and &2) to ensure they are consistent. You can do this by checking the CDS view definitions in the ABAP Development Tools or SE11 transaction.
  Add Missing Field: If the field (&3) is indeed required as part of the key for entity (&1), you may need to modify the CDS view to include this field in its key definition.
  Synchronize Changes: If there have been recent changes to the data model, ensure that all related CDS views and data sources are updated accordingly.
  Consult Documentation: Review any relevant documentation or change logs to understand why the key definitions may have diverged.
  Testing: After making changes, test the CDS views to ensure that the error is resolved and that the data is being retrieved correctly.
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) views are a way to define semantic data models in SAP. They allow for the definition of complex data models and can be used in various applications.
  Key Fields: Key fields are essential for uniquely identifying records in a database table or view. In CDS views, they are defined using the @Key annotation.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message, as there may be specific fixes or recommendations provided by SAP.
  
  If the issue persists after following these steps, consider reaching out to your SAP support team or consulting the SAP Community for further assistance.