How To Fix SADL_GW_DT_SB_UI023 - Property '&1' of entity type '&2' must not 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: 023

• Message text: Property '&1' of entity type '&2' must not 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_UI023 - Property '&1' of entity type '&2' must not be a key field ?

  The SAP error message SADL_GW_DT_SB_UI023 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 (SDAL). Specifically, the error states that a property (field) that is being defined as a key field for an entity type is not allowed to be a key field based on the underlying data model or the OData service definition.
  Cause:
  
  Incorrect Key Field Definition: The property specified in the error message is being defined as a key field in the entity type, but it does not meet the criteria for being a key field. In OData, key fields are typically unique identifiers for an entity.
  Model Configuration Issues: There may be a mismatch between the data model and the OData service definition, where a non-unique or non-identifiable field is incorrectly marked as a key.
  Data Model Constraints: The underlying data model may have constraints that prevent certain fields from being used as key fields.
  
  Solution:
  
  Review Entity Type Definition: Check the definition of the entity type in the data model. Ensure that the property specified in the error message is not marked as a key field if it does not meet the criteria for uniqueness.
  Modify the OData Service: If the property is incorrectly defined as a key field, modify the OData service definition to remove it from the key fields list.
  Use Appropriate Key Fields: Ensure that the key fields defined for the entity type are appropriate and meet the uniqueness requirement. Typically, a key field should be a unique identifier for the entity, such as an ID or a combination of fields that can uniquely identify a record.
  Regenerate the Service: After making changes to the entity type definition, regenerate the OData service to ensure that the changes are reflected in the service metadata.
  Test the Changes: After making the necessary adjustments, test the OData service to ensure that the error no longer occurs and that the service behaves as expected.
  
  Related Information:
  
  SAP Gateway: The SAP Gateway is a technology that enables the connection of devices and applications to SAP systems. It allows for the creation of OData services that can be consumed by various clients.
  OData Services: OData (Open Data Protocol) is a standard protocol for building and consuming RESTful APIs. Understanding OData conventions and how to define entity types and key fields is crucial for working with SAP Gateway services.
  SAP Documentation: Refer to the official SAP documentation for detailed guidelines on defining entity types, key fields, and working with the Service Data Layer.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP support team or consulting the SAP Community for further assistance.