How To Fix EIT_GW_COMMON021 - JSON Property &1 has no primitve type.

SAP Error Message - Details

• Message type: E = Error

• Message class: EIT_GW_COMMON - Extensibility Template: Common Messages

• Message number: 021

• Message text: JSON Property &1 has no primitve type.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message EIT_GW_COMMON021 - JSON Property &1 has no primitve type. ?

  The SAP error message EIT_GW_COMMON021 indicates that there is an issue with a JSON property in your SAP Gateway service. Specifically, the error message states that the JSON property specified (denoted by &1) does not have a primitive type. This typically means that the property is expected to be a simple data type (like string, integer, boolean, etc.), but it is not defined as such in the service's metadata.
  Cause:
  
  Incorrect Data Type Definition: The property in the data model might be defined as a complex type instead of a primitive type. This can happen if the data model is not correctly set up in the backend.
  Service Metadata Issues: The service metadata might not be correctly generated or might be out of sync with the underlying data model.
  JSON Structure: The JSON being sent to the service might not match the expected structure, leading to the service expecting a primitive type but receiving a complex type instead.
  
  Solution:
  
  Check Data Model: Review the data model in the backend (e.g., in the ABAP Dictionary or the Data Modeler) to ensure that the property in question is defined as a primitive type.
  Regenerate Service Metadata: If the data model is correct, try regenerating the service metadata. This can be done using transaction code /IWFND/MAINT_SERVICE to maintain the service and regenerate the metadata.
  Validate JSON Structure: Ensure that the JSON being sent to the service matches the expected structure. If the property is supposed to be a primitive type, make sure that the JSON reflects that (e.g., no nested objects or arrays).
  Check Service Implementation: If you are implementing custom logic, ensure that the implementation correctly handles the data types and that the response structure matches the expected output.
  
  Related Information:
  
  SAP Gateway: This error is related to the SAP Gateway framework, which allows for the creation of OData services.
  OData Services: Understanding OData service definitions and how they map to backend data models can help in troubleshooting such issues.
  Debugging Tools: Use tools like the SAP Gateway Client (transaction /IWFND/GW_CLIENT) to test your OData services and see the raw JSON responses and requests.
  Documentation: Refer to SAP documentation on OData services and the SAP Gateway for more detailed information on data types and service definitions.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.