How To Fix /IWFND/CM_IFL020 - Invalid navigation information with a second predicate

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_IFL -

• Message number: 020

• Message text: Invalid navigation information with a second predicate

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_IFL020 - Invalid navigation information with a second predicate ?

  The SAP error message /IWFND/CM_IFL020 Invalid navigation information with a second predicate typically occurs in the context of SAP Gateway and OData services. This error indicates that there is an issue with the navigation properties in your OData service, particularly when there are multiple predicates in the query that are not properly defined or supported.
  Cause:
  
  
  Invalid Navigation Path: The error often arises when the OData service is trying to navigate through an entity set using a path that is not correctly defined in the metadata. This can happen if the navigation properties are not set up correctly in the service or if the entity relationships are not properly defined.
  
  
  Multiple Predicates: The error specifically mentions "a second predicate," which suggests that the query being executed has multiple conditions that are conflicting or not supported by the navigation properties defined in the OData service.
  
  
  Service Implementation Issues: There may be issues in the implementation of the service, such as incorrect handling of the navigation properties in the code or the service not being able to resolve the navigation due to missing or incorrect associations.
  
  
  Solution:
  
  
  Check Metadata: Review the metadata of your OData service to ensure that the navigation properties and associations are correctly defined. You can access the metadata by appending $metadata to the service URL.
  
  
  Review Query: Analyze the query that is being sent to the OData service. Ensure that the navigation paths and predicates are valid and correspond to the defined navigation properties in the metadata.
  
  
  Debugging: If you have access to the backend implementation, consider debugging the service to see how the navigation properties are being processed. Look for any logic that might be incorrectly handling multiple predicates.
  
  
  Service Implementation: If you are developing or maintaining the OData service, ensure that the implementation correctly supports the navigation properties and handles multiple predicates appropriately. This may involve modifying the logic to correctly interpret the navigation paths.
  
  
  Testing: After making changes, test the OData service with various queries to ensure that it behaves as expected and does not produce the error.
  
  
  Related Information:
  
  SAP Gateway: Familiarize yourself with the SAP Gateway framework and how it handles OData services, including navigation properties and entity relationships.
  OData Protocol: Understanding the OData protocol can help in troubleshooting issues related to queries, navigation, and entity relationships.
  SAP Community: Consider searching or posting in the SAP Community forums for additional insights or similar experiences from other users.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.