How To Fix SADL_GW_DT_SB_UI021 - Identifier property '&1' of entity type '&2' must be typed by Edm.String

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 021

• Message text: Identifier property '&1' of entity type '&2' must be typed by Edm.String

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW_DT_SB_UI021 - Identifier property '&1' of entity type '&2' must be typed by Edm.String ?

  The SAP error message SADL_GW_DT_SB_UI021 indicates that there is an issue with the data model in your SAP system, specifically related to the identifier property of an entity type. The error message states that the identifier property &1 of entity type &2 must be typed as Edm.String. 
  Cause:
  This error typically occurs when:
  
  The identifier property (usually a key field) of an entity is not defined with the correct data type in the metadata of the OData service.
  The identifier property is expected to be a string (Edm.String), but it is defined as a different type (e.g., Edm.Int32, Edm.Boolean, etc.).
  There may be inconsistencies in the data model or the way the OData service is generated or consumed.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Data Model:
  
  Review the definition of the entity type in the data model. Ensure that the identifier property is defined as Edm.String.
  If you are using a CDS (Core Data Services) view, check the annotations and ensure that the key field is correctly defined.
  
  
  
  Modify the Entity Definition:
  
  If the identifier property is incorrectly typed, modify the entity definition to change the type to Edm.String.
  If you are using a custom OData service, ensure that the service implementation aligns with the expected data types.
  
  
  
  Regenerate the OData Service:
  
  If you made changes to the data model, regenerate the OData service to ensure that the changes are reflected in the service metadata.
  
  
  
  Check Service Metadata:
  
  Use the OData service metadata endpoint (usually /sap/opu/odata/sap/<service_name>/$metadata) to verify the data types of the properties in the entity type. Ensure that the identifier property is listed as Edm.String.
  
  
  
  Test the Changes:
  
  After making the necessary changes, test the OData service again to ensure that the error is resolved.
  
  
  
  Related Information:
  
  OData Services: Understanding how OData services work in SAP can help in troubleshooting issues related to data types and entity definitions.
  CDS Views: If you are using CDS views, familiarize yourself with the syntax and annotations used to define entity types and their properties.
  SAP Notes: Check for any relevant SAP Notes or documentation that may provide additional insights or solutions related to this error message.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting the SAP community for further assistance.