How To Fix SD_CDS_ENTITY054 - The first field must be a key field

SAP Error Message - Details

• Message type: E = Error

• Message class: SD_CDS_ENTITY - Messages for STOBS/entities

• Message number: 054

• Message text: The first field must be a key field

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SD_CDS_ENTITY054 - The first field must be a key field ?

  The SAP error message SD_CDS_ENTITY054 indicates that there is an issue with the definition of a Core Data Services (CDS) view in the context of the Sales and Distribution (SD) module. Specifically, the error states that "The first field must be a key field," which means that the first field defined in the CDS view must be a key field for the view to function correctly.
  Cause:
  
  Incorrect Field Order: The first field in the CDS view is not defined as a key field. In SAP CDS views, the first field must be a key field to ensure that the view can be uniquely identified.
  View Definition Issues: The view may have been incorrectly defined in the ABAP Development Tools or the SAP HANA Studio, leading to this error.
  Data Model Constraints: The underlying data model may have constraints that require the first field to be a key field.
  
  Solution:
  To resolve the error, you need to modify the CDS view definition to ensure that the first field is a key field. Here are the steps to do this:
  
  Open the CDS View: Access the CDS view in the ABAP Development Tools or SAP HANA Studio.
  Check Field Definitions: Review the field definitions in the view. Identify the first field in the SELECT statement.
  Change Field Order: If the first field is not a key field, either:
  
  Change the order of the fields so that a key field is the first one.
  Modify the definition of the first field to make it a key field if appropriate.
  
  
  Save and Activate: After making the necessary changes, save and activate the CDS view.
  Test the View: Execute the view to ensure that the error is resolved.
  
  Related Information:
  
  Key Fields in CDS Views: Key fields are essential for uniquely identifying records in a data model. In CDS views, they are defined using the @Key annotation.
  CDS Annotations: Familiarize yourself with CDS annotations, as they play a crucial role in defining the behavior and properties of the view.
  SAP Documentation: Refer to the official SAP documentation for Core Data Services for more detailed information on defining views and understanding key fields.
  Debugging Tools: Use debugging tools in SAP to trace the execution of the CDS view and identify any other potential issues.
  
  By following these steps, you should be able to resolve the error and ensure that your CDS view is correctly defined.