How To Fix SADL_GW_DT_SB_UI029 - CDS-Entity '&1' does not contain a key field

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW_DT_SB_UI - Gateway Service Builder UI Integration for SADL

• Message number: 029

• Message text: CDS-Entity '&1' does not contain a key field

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW_DT_SB_UI029 - CDS-Entity '&1' does not contain a key field ?

  The SAP error message SADL_GW_DT_SB_UI029 indicates that the Core Data Services (CDS) entity you are trying to use does not contain a key field. This is a common issue when working with CDS views in SAP, especially when they are intended to be exposed as OData services.
  Cause:
  
  Missing Key Field: The CDS entity must have at least one key field defined. Key fields are essential for uniquely identifying records in the entity.
  Incorrect Annotations: The annotations that define the key fields may be missing or incorrectly specified in the CDS view.
  View Definition Issues: The underlying SQL or logic in the CDS view may not be correctly set up to include a key field.
  
  Solution:
  
  
  Define Key Fields: Ensure that your CDS view includes at least one key field. You can do this by using the @Key annotation in your CDS view definition. For example:
  define view ZMy_CDS_View
  as select from my_table
  {
      key field1,
      field2,
      field3
  }
  In this example, field1 is defined as a key field.
  
  
  Check Annotations: Review the annotations in your CDS view to ensure that they are correctly defined. The key fields should be annotated properly.
  
  
  Review the Data Model: If your CDS view is based on multiple tables or joins, ensure that the key fields are correctly defined in the context of the entire data model.
  
  
  Activate the CDS View: After making changes, make sure to activate the CDS view to apply the changes.
  
  
  Test the OData Service: If the CDS view is exposed as an OData service, test the service again after making the necessary changes to ensure that the error is resolved.
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation on CDS views and OData services for detailed guidelines on defining key fields and annotations.
  SAP Community: Engage with the SAP Community forums for discussions and solutions related to similar issues.
  Debugging Tools: Use transaction codes like SE11 (Data Dictionary) and SE80 (Object Navigator) to inspect and modify your CDS views.
  
  By ensuring that your CDS entity has the necessary key fields defined, you should be able to resolve the error message SADL_GW_DT_SB_UI029.