How To Fix /IWBEP/CM_CP220 - Only one navigation property is allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_CP -

• Message number: 220

• Message text: Only one navigation property is allowed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_CP220 - Only one navigation property is allowed ?

  The SAP error message /IWBEP/CM_CP220 Only one navigation property is allowed typically occurs in the context of SAP Gateway and OData services when there is an issue with the way navigation properties are defined in your OData model. This error indicates that the OData service is trying to define multiple navigation properties for a single entity, which is not allowed.
  Cause:
  
  Multiple Navigation Properties: The error is triggered when an entity type in your OData model has more than one navigation property pointing to the same target entity. OData specifications allow only one navigation property to a specific target entity from a source entity.
  Model Definition Issues: There may be a misconfiguration in the way the entity types and their relationships are defined in the data model.
  Service Implementation: The implementation of the OData service might be incorrectly set up, leading to multiple navigation properties being exposed.
  
  Solution:
  
  Review Entity Definitions: Check the entity definitions in your OData model. Ensure that each entity type has only one navigation property pointing to a specific target entity.
  Modify Navigation Properties: If you find multiple navigation properties pointing to the same entity, you will need to consolidate them into a single navigation property. This may involve changing the model or the way relationships are defined.
  Regenerate the Service: After making changes to the model, regenerate the OData service to ensure that the changes are reflected in the service metadata.
  Test the Service: After making the necessary adjustments, test the OData service to ensure that the error is resolved and that the navigation properties work as expected.
  
  Related Information:
  
  OData Specifications: Familiarize yourself with the OData specifications regarding entity relationships and navigation properties. This will help you understand the limitations and requirements for defining navigation properties.
  SAP Gateway Documentation: Refer to the SAP Gateway documentation for guidelines on defining OData services and best practices for entity relationships.
  Debugging Tools: Use debugging tools available in SAP Gateway to trace the service calls and identify where the navigation properties are being defined incorrectly.
  
  By following these steps, you should be able to resolve the /IWBEP/CM_CP220 Only one navigation property is allowed error and ensure that your OData service is correctly configured.