How To Fix SADL_GW_DT_SB_UI020 - Identifier property '&1' of entity type '&2' must be 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: 020

• Message text: Identifier property '&1' of entity type '&2' must be a key field

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW_DT_SB_UI020 - Identifier property '&1' of entity type '&2' must be a key field ?

  The SAP error message SADL_GW_DT_SB_UI020 indicates that there is an issue with the definition of an entity type in the context of the SAP Gateway and the Service Data Layer (SADL). Specifically, the error states that the identifier property (which is typically a unique identifier for an entity) must be defined as a key field in the entity type.
  Cause:
  
  Entity Definition Issue: The entity type defined in your OData service does not have the specified identifier property (&1) marked as a key field. In OData, key fields are essential for uniquely identifying instances of an entity.
  Model Configuration: The metadata of the OData service may not be correctly configured, leading to the identifier not being recognized as a key.
  Data Model Changes: If there have been recent changes to the data model or entity definitions, it is possible that the key field configuration was inadvertently altered.
  
  Solution:
  
  
  Check Entity Definition:
  
  Go to the relevant data model or entity definition in your SAP system (e.g., using transaction code SEGW for OData services).
  Ensure that the property identified by &1 is marked as a key field in the entity type &2. You can do this by:
  
  Opening the entity type in the model.
  Checking the properties and ensuring that the key property is correctly defined.
  
  
  
  
  
  Update Metadata:
  
  If you have made changes to the entity definition, regenerate the metadata for the OData service. This can typically be done in the service builder (SEGW) by right-clicking on the service and selecting "Generate Runtime Objects".
  
  
  
  Check Service Implementation:
  
  Ensure that the implementation of the service correctly handles the key fields. If you are using custom logic, verify that it adheres to the OData standards.
  
  
  
  Test the Service:
  
  After making the necessary changes, test the OData service to ensure that the error is resolved and that the service behaves as expected.
  
  
  
  Related Information:
  
  OData Services: Understanding how OData services work in SAP is crucial. Key fields are fundamental to the OData protocol, as they allow clients to uniquely identify resources.
  SAP Gateway: Familiarize yourself with the SAP Gateway framework, which facilitates the creation of OData services and the interaction between SAP systems and external applications.
  Documentation: Refer to SAP documentation for detailed guidelines on defining entity types and key fields in OData services.
  
  If the issue persists after following these steps, consider checking SAP Notes or reaching out to SAP support for further assistance.