How To Fix /IWFND/MED_SVC_MU_LA013 - More than one node for root node ID '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/MED_SVC_MU_LA -

• Message number: 013

• Message text: More than one node for root node ID '&1'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/MED_SVC_MU_LA013 - More than one node for root node ID '&1' ?

  The SAP error message /IWFND/MED_SVC_MU_LA013 indicates that there is an issue with the data model in your OData service. Specifically, it means that there is more than one node associated with the root node ID specified in the error message. This typically occurs in the context of a service that is expected to return a single entity but is instead returning multiple entities.
  Cause:
  
  Data Model Configuration: The OData service is configured in such a way that it expects a single root node, but the underlying data model or the query is returning multiple nodes.
  Service Implementation: The implementation of the OData service might not be correctly filtering or aggregating the data, leading to multiple entries being returned for what should be a single root node.
  Incorrect Query Parameters: The request made to the OData service might not be correctly formed, leading to unexpected results.
  
  Solution:
  
  Check the Data Model: Review the data model configuration in the SAP Gateway Service Builder (transaction code SEGW). Ensure that the entity types and associations are correctly defined.
  Review the Service Implementation: Look at the implementation of the service methods (e.g., GET_ENTITY, GET_ENTITYSET) in the Data Provider Class (DPC). Ensure that the logic correctly retrieves a single entity when expected.
  Adjust Query Parameters: If the service is being called with specific query parameters, ensure that these parameters are correctly filtering the data to return a single entity.
  Debugging: Use the debugger to step through the service implementation to see how the data is being retrieved and where the logic might be failing.
  Check for Duplicates: Ensure that the underlying database does not have duplicate entries that could be causing multiple nodes to be returned.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide guidance on similar issues.
  OData Documentation: Review the OData documentation for best practices on defining entity types and handling queries.
  Community Forums: Look for discussions in SAP Community or other forums where similar issues have been addressed.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.