How To Fix /IWBEP/CM_V4_MED193 - No nullable setting on collection nav. property '&1' (complex type '&2')

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 193

• Message text: No nullable setting on collection nav. property '&1' (complex type '&2')

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED193 - No nullable setting on collection nav. property '&1' (complex type '&2') ?

  The SAP error message /IWBEP/CM_V4_MED193 indicates that there is an issue with the configuration of a navigation property in an OData service. Specifically, it states that there is "No nullable setting on collection navigation property '&1' (complex type '&2')". This typically occurs when you are trying to define a navigation property that is a collection of complex types, but the nullable setting is not configured correctly.
  Cause:
  
  Navigation Property Configuration: The navigation property in the OData model is defined as a collection, but it does not have the nullable setting configured properly. In OData, collection navigation properties can either be nullable or non-nullable, and this needs to be explicitly defined.
  Model Definition: The underlying data model may not be set up to allow for null values in the collection, which can lead to this error when the OData service is trying to process requests involving that navigation property.
  
  Solution:
  
  
  Check the OData Model: Review the definition of the OData model in your ABAP code or the service definition. Ensure that the navigation property is defined correctly with the appropriate nullable setting.
  
  If the navigation property is meant to be nullable, ensure that it is defined as such in the model.
  If it should not be nullable, ensure that the data source can provide a valid collection.
  
  
  
  Adjust the Metadata: If you are using the SAP Gateway Service Builder (transaction code SEGW), you can adjust the metadata for the entity type and navigation property:
  
  Open the service in SEGW.
  Navigate to the entity type that contains the navigation property.
  Check the properties of the navigation property and ensure that the "Nullable" setting is configured correctly.
  
  
  
  Regenerate the Service: After making changes to the model, regenerate the OData service to ensure that the changes take effect. This can be done in the SEGW transaction by right-clicking on the service and selecting "Generate".
  
  
  Test the Service: After making the necessary adjustments, test the OData service to ensure that the error no longer occurs and that the navigation property behaves as expected.
  
  
  Related Information:
  
  OData Specification: Familiarize yourself with the OData V4 specification, particularly regarding navigation properties and their nullable settings.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on configuring OData services.
  Debugging: If the issue persists, consider using debugging tools to trace the execution of the OData service and identify where the configuration might be going wrong.
  
  By following these steps, you should be able to resolve the error message /IWBEP/CM_V4_MED193 and ensure that your OData service is configured correctly.