/IWFND/CM_MGW_RT163 - Tag '&1' already exists. Application programming error

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW_RT -

• Message number: 163

• Message text: Tag '&1' already exists. Application programming error

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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AnswerBot

• What is the cause and solution for SAP error message /IWFND/CM_MGW_RT163 - Tag '&1' already exists. Application programming error ?

  The SAP error message /IWFND/CM_MGW_RT163 with the description "Tag '&1' already exists. Application programming error" typically occurs in the context of SAP Gateway and OData services. This error indicates that there is a conflict with the tags being used in your OData service, specifically that a tag with the same name has already been defined.
  Cause:
  
  Duplicate Tags: The most common cause of this error is that the same tag is being defined multiple times in the service metadata or in the implementation of the OData service.
  Incorrect Annotations: If you are using annotations in your service, there may be a conflict in the way they are defined.
  Service Implementation Issues: There may be issues in the implementation of the service, such as incorrect handling of entity sets or navigation properties.
  
  Solution:
  
  
  Check for Duplicate Tags: Review the metadata of your OData service to identify if the tag mentioned in the error message is defined more than once. You can do this by:
  
  Accessing the service metadata URL (e.g., http://<your_sap_system>/sap/opu/odata/sap/<your_service>/$metadata) and searching for the tag.
  Ensuring that each tag is unique within the context of the service.
  
  
  
  Review Annotations: If you are using annotations, ensure that they are correctly defined and do not conflict with existing tags.
  
  
  Debug the Implementation: If the issue persists, you may need to debug the implementation of your OData service:
  
  Check the code in the Data Provider Class (DPC) and the Model Provider Class (MPC) for any logic that might be causing the duplication.
  Look for any methods that might be adding tags to the response and ensure they are not being called multiple times.
  
  
  
  Clear Cache: Sometimes, the issue may be related to caching. Clear the cache of the OData service:
  
  Use transaction code /IWFND/MAINT_SERVICE to maintain your service and clear the cache.
  
  
  
  Re-activate the Service: If you have made changes to the service, re-activate it to ensure that all changes are applied.
  
  
  Check for Updates: Ensure that your SAP system is up to date with the latest support packages and notes, as there may be fixes related to this issue.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to OData services and the specific error message for any known issues or patches.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Documentation: Review the official SAP documentation on OData services and SAP Gateway for best practices and troubleshooting tips.
  
  By following these steps, you should be able to identify and resolve the cause of the /IWFND/CM_MGW_RT163 error in your SAP system.