How To Fix RSODP_ABAP_CDS330 - Error while reading CDC annotations: Wrong number of key fields mapped

SAP Error Message - Details

• Message type: E = Error

• Message class: RSODP_ABAP_CDS -

• Message number: 330

• Message text: Error while reading CDC annotations: Wrong number of key fields mapped

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSODP_ABAP_CDS330 - Error while reading CDC annotations: Wrong number of key fields mapped ?

  The SAP error message RSODP_ABAP_CDS330 indicates that there is an issue with the mapping of key fields in a Core Data Services (CDS) view, particularly when dealing with Change Data Capture (CDC) annotations. This error typically arises when the number of key fields defined in the CDS view does not match the number of key fields expected by the underlying data source or the CDC configuration.
  Cause:
  
  Mismatch in Key Fields: The most common cause of this error is a mismatch between the key fields defined in the CDS view and those in the underlying database table or the data source. If the CDS view expects a certain number of key fields but the data source provides a different number, this error will occur.
  Incorrect Annotations: If the annotations related to CDC are not correctly defined, it can lead to this error. For example, if the @Analytics.dataCategory or other relevant annotations are not properly set, it may cause issues in reading the CDC annotations.
  Changes in Data Model: If there have been recent changes to the underlying data model (like adding or removing key fields) without updating the CDS view accordingly, this can lead to inconsistencies.
  
  Solution:
  
  Check Key Field Definitions: Review the key fields defined in your CDS view and ensure they match the key fields in the underlying database table. You can do this by checking the table structure in the Data Dictionary (SE11) and comparing it with the CDS view definition.
  Update Annotations: Ensure that all relevant annotations for CDC are correctly defined in your CDS view. This includes checking for proper usage of @ChangeTracking and other related annotations.
  Adjust the CDS View: If there are discrepancies, you may need to adjust the CDS view to align with the underlying data model. This could involve adding or removing key fields as necessary.
  Re-activate the CDS View: After making changes, make sure to re-activate the CDS view to apply the updates.
  Check for Transport Issues: If this error occurs after a transport, ensure that all related objects (like tables, views, and annotations) have been transported correctly.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional guidance on CDC and CDS views.
  Documentation: Review the official SAP documentation on Core Data Services and Change Data Capture to understand the requirements and best practices for defining key fields and annotations.
  Debugging: If the issue persists, consider using debugging tools to trace the execution and identify where the mismatch occurs.
  
  By following these steps, you should be able to resolve the RSODP_ABAP_CDS330 error and ensure that your CDS view is correctly configured for Change Data Capture.