How To Fix /IWFND/MED_SVC_MU_LA019 - No reference ID for target node ID '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/MED_SVC_MU_LA -

• Message number: 019

• Message text: No reference ID for target node ID '&1'

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/MED_SVC_MU_LA019 - No reference ID for target node ID '&1' ?

  The SAP error message /IWFND/MED_SVC_MU_LA019 No reference ID for target node ID '&1' typically occurs in the context of SAP Gateway and OData services. This error indicates that the system is unable to find a reference ID for a specified target node in the OData service. Here’s a breakdown of the potential causes, solutions, and related information:
  Causes:
  
  Missing Reference ID: The target node in the OData service is expected to have a reference ID, but it is missing or not properly defined.
  Incorrect Data Model: The data model defined in the OData service may not align with the underlying data structure, leading to inconsistencies.
  Service Configuration Issues: There may be issues with the service configuration in the SAP Gateway, such as incorrect mappings or missing associations.
  Authorization Issues: The user may not have the necessary authorizations to access the data, leading to the inability to retrieve the reference ID.
  Backend Issues: There could be issues in the backend system that prevent the retrieval of the required data.
  
  Solutions:
  
  Check Data Model: Review the OData service's data model to ensure that all entities and associations are correctly defined and that reference IDs are properly set up.
  Service Metadata: Use the service metadata (usually accessible via the service URL with $metadata) to verify that the target node and its properties are correctly defined.
  Debugging: Use transaction /IWFND/ERROR_LOG to check for any additional error messages or logs that can provide more context about the issue.
  Check Service Implementation: If you are using a custom implementation, ensure that the logic for handling the target node is correctly implemented and that it returns the expected reference ID.
  Authorization Check: Verify that the user has the necessary authorizations to access the OData service and the underlying data.
  Re-register the Service: If the service has been modified, consider re-registering it using transaction /IWFND/MAINT_SERVICE to ensure that all changes are applied correctly.
  Consult Documentation: Review SAP documentation or notes related to the specific OData service you are working with for any known issues or additional troubleshooting steps.
  
  Related Information:
  
  SAP Gateway: Understanding the architecture and components of SAP Gateway can help in troubleshooting issues related to OData services.
  OData Protocol: Familiarity with the OData protocol and how it interacts with SAP systems can provide insights into potential issues.
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific error message or OData service you are working with.
  
  If the issue persists after trying the above solutions, it may be beneficial to engage with SAP support or consult with a technical expert who specializes in SAP Gateway and OData services.