How To Fix EIT_GW_COMMON016 - Value of navigation property &1 must be an array.

SAP Error Message - Details

• Message type: E = Error

• Message class: EIT_GW_COMMON - Extensibility Template: Common Messages

• Message number: 016

• Message text: Value of navigation property &1 must be an array.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message EIT_GW_COMMON016 - Value of navigation property &1 must be an array. ?

  The SAP error message EIT_GW_COMMON016 indicates that there is an issue with the value of a navigation property in an OData service. Specifically, the error states that the value of the navigation property must be an array, but it is not. This typically occurs when the OData service is expecting a collection of entities (an array) but receives a single entity or a different data type instead.
  Cause:
  
  Incorrect Data Structure: The data being sent to the OData service does not match the expected structure. For example, if the navigation property is defined as a collection in the OData model, but the client sends a single object instead of an array, this error will occur.
  Client-Side Code Issues: The client application (e.g., an SAP Fiori app or another frontend) may be incorrectly constructing the payload for the OData request.
  Service Definition Mismatch: There may be a mismatch between the OData service definition and the actual data being sent. This can happen if the service was updated but the client code was not adjusted accordingly.
  
  Solution:
  
  Check the OData Model: Review the OData service metadata to confirm the expected structure of the navigation property. Ensure that it is defined as a collection (array).
  Adjust the Payload: Modify the client-side code to ensure that when sending data to the OData service, the navigation property is always sent as an array, even if it contains only one item. For example:
  {
      "navigationProperty": [
          {
              "property1": "value1",
              "property2": "value2"
          }
      ]
  }
  
  Debugging: Use debugging tools or logs to inspect the payload being sent to the OData service. This can help identify if the navigation property is being sent correctly.
  Update Client Code: If the OData service has been updated, ensure that the client application is also updated to match the new service definition.
  
  Related Information:
  
  OData Documentation: Familiarize yourself with OData standards and best practices, especially regarding entity relationships and navigation properties.
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific OData service you are using.
  Community Forums: Engage with SAP community forums or support channels for additional insights or similar issues faced by other users.
  
  By following these steps, you should be able to resolve the EIT_GW_COMMON016 error and ensure that your OData service interactions are functioning correctly.