How To Fix SADL_GW012 - The entity &1 can only be accessed by navigation or expand

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW -

• Message number: 012

• Message text: The entity &1 can only be accessed by navigation or expand

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW012 - The entity &1 can only be accessed by navigation or expand ?

  The SAP error message SADL_GW012 indicates that the entity you are trying to access can only be accessed through navigation or an expand operation in the context of SAP Gateway and OData services. This typically occurs when you are trying to directly access a related entity that is not directly exposed as a standalone entity in the OData service.
  Cause:
  
  Entity Relationship: The entity you are trying to access is likely a child or related entity that is not directly accessible without navigating from a parent entity.
  OData Service Definition: The OData service may not be configured to allow direct access to the entity. Instead, it requires you to navigate from a parent entity or use an expand operation to retrieve related data.
  Incorrect URL: The URL you are using to access the entity may be incorrect or not aligned with the OData service's structure.
  
  Solution:
  
  Use Navigation: Instead of trying to access the entity directly, navigate from the parent entity. For example, if you have a parent entity A and a child entity B, you should access B through A (e.g., /A('key')/B).
  Use Expand: If you want to retrieve the related entity data along with the parent entity, you can use the $expand query option in your OData request. For example:
  /A?$expand=B
  This will retrieve the parent entity A along with its related entity B.
  
  Check OData Service Metadata: Review the metadata of the OData service to understand the relationships and how entities are structured. This can help you determine the correct way to access the data.
  Consult Documentation: Refer to the SAP documentation for the specific OData service you are using to understand its capabilities and limitations.
  
  Related Information:
  
  OData Protocol: Understanding the OData protocol and how it handles entity relationships can be beneficial. OData supports navigation properties that allow you to traverse relationships between entities.
  SAP Gateway: Familiarize yourself with SAP Gateway and how it exposes data through OData services. This includes understanding how to define entities, relationships, and navigation properties in the service.
  Debugging Tools: Use tools like SAP Gateway Client (transaction /IWFND/GW_CLIENT) to test your OData service and see how entities are structured and related.
  
  By following these steps, you should be able to resolve the SADL_GW012 error and successfully access the desired entity data.