How To Fix /IWFND/MED_SVC_MU_LA018 - No reference ID for source node ID '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/MED_SVC_MU_LA -

• Message number: 018

• Message text: No reference ID for source 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_LA018 - No reference ID for source node ID '&1' ?

  The SAP error message /IWFND/MED_SVC_MU_LA018 No reference ID for source node ID '&1' typically occurs in the context of SAP Gateway and OData services. This error indicates that there is a missing reference ID for a source node in the data model, which can prevent the proper functioning of the OData service.
  Cause:
  
  Missing Reference ID: The error suggests that the system is trying to access a source node that does not have a corresponding reference ID. This can happen if the data model is not properly defined or if there are inconsistencies in the data being processed.
  Incorrect Data Model Configuration: If the OData service is not correctly configured, it may lead to issues where the expected reference IDs are not available.
  Data Integrity Issues: If the underlying data does not maintain the expected relationships (e.g., foreign keys), it can lead to this error.
  Service Implementation Issues: Custom implementations or modifications in the OData service might lead to missing references.
  
  Solution:
  
  Check Data Model: Review the data model in the SAP Gateway service to ensure that all nodes and their relationships are correctly defined. Make sure that the source node ID referenced in the error message is properly configured.
  Validate Data: Ensure that the underlying data in the database is consistent and that all necessary reference IDs are present. You may need to check the relevant tables for missing or incorrect entries.
  Debugging: Use transaction code /IWFND/ERROR_LOG to check for additional error details. You can also use the SAP Gateway Client (transaction /IWFND/GW_CLIENT) to test the OData service and see if you can replicate the issue.
  Check Service Implementation: If you have custom logic in your OData service, review the implementation to ensure that it correctly handles the relationships between entities.
  Regenerate Service: If you have made changes to the data model, consider regenerating the OData service to ensure that all changes are reflected.
  Consult Documentation: Refer to SAP documentation or community forums for any known issues related to the specific version of SAP Gateway you are using.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  SAP Community: Engage with the SAP Community for insights from other users who may have encountered similar issues.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as /IWFND/MAINT_SERVICE for service maintenance and /IWFND/ERROR_LOG for error logs.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.