How To Fix FDT_HRF124 - CDS document &1 contains key fields from multiple tables

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_HRF - FDT: HRF

• Message number: 124

• Message text: CDS document &1 contains key fields from multiple tables

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_HRF124 - CDS document &1 contains key fields from multiple tables ?

  The SAP error message FDT_HRF124 indicates that there is an issue with a Core Data Services (CDS) view or document that is trying to use key fields from multiple tables. This can occur when the CDS view is not properly defined, leading to ambiguity in how the data is being retrieved or joined.
  Cause:
  The error typically arises due to the following reasons:
  
  Multiple Key Fields: The CDS view is attempting to include key fields from more than one table, which can lead to confusion about which key should be used for identification.
  Improper Join Conditions: The join conditions between the tables may not be correctly defined, leading to a situation where the system cannot determine a single key for the resulting dataset.
  Inconsistent Data Model: The underlying data model may not be designed to support the intended use of the CDS view, especially if the tables involved are not related in a way that allows for a clear key definition.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Review the CDS View Definition:
  
  Check the definition of the CDS view to ensure that it is not trying to select key fields from multiple tables without a clear relationship.
  If necessary, modify the view to include only one set of key fields or ensure that the key fields from different tables are properly qualified.
  
  
  
  Adjust Join Conditions:
  
  Ensure that the join conditions between the tables are correctly defined. This may involve adding or modifying join conditions to ensure that the relationships between the tables are clear and unambiguous.
  
  
  
  Use Annotations:
  
  If you need to include key fields from multiple tables, consider using annotations to explicitly define how the keys should be treated. This can help the system understand how to handle the keys.
  
  
  
  Test the CDS View:
  
  After making changes, test the CDS view to ensure that it no longer produces the error and that it returns the expected results.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or community forums for additional guidance on defining CDS views and handling key fields.
  
  
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) is a framework for defining semantically rich data models in SAP. Understanding how to properly define and use CDS views is crucial for effective data modeling.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context on best practices for defining CDS views.
  SAP Community: Engage with the SAP Community for insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the FDT_HRF124 error and ensure that your CDS view is correctly defined and functional.