How To Fix R9E978 - Unable to load; duplicate technical name '&1' for '&2' and '&3'

SAP Error Message - Details

• Message type: E = Error

• Message class: R9E - Error Messages for Query Designer .NET

• Message number: 978

• Message text: Unable to load; duplicate technical name '&1' for '&2' and '&3'

What causes this issue?

You are trying to open a query or a filter in Query Designer. During
loading, the system found that the same technical name &V1& is used in
&V2& and &V3& . This is not permitted.

System Response

Loading is cancelled.

How to fix this error?

Delete one of the two duplicate elements. You will then be able to open
the other element.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message R9E978 - Unable to load; duplicate technical name '&1' for '&2' and '&3' ?

  The SAP error message R9E978 indicates that there is a conflict due to a duplicate technical name in the system. This typically occurs when two or more objects (like programs, function modules, or classes) have been assigned the same technical name, which leads to ambiguity when the system tries to load or access them.
  Cause:
  
  Duplicate Technical Names: The primary cause of this error is that two or more objects have been created with the same technical name. This can happen during development when multiple developers create objects without proper coordination or naming conventions.
  Transport Issues: If objects are transported from one system to another (e.g., from development to production), and there are naming conflicts, this error can arise.
  Namespace Conflicts: If you are using a custom namespace and there are conflicts with standard SAP objects or other custom objects, this can also lead to this error.
  
  Solution:
  
  Identify Duplicates: Use transaction SE80 (Object Navigator) or SE11 (Data Dictionary) to search for the technical name mentioned in the error message. Check if there are multiple objects with the same name.
  Rename Objects: If duplicates are found, you will need to rename one of the conflicting objects to ensure that each object has a unique technical name. This can be done using transaction SE80 or SE37 (for function modules).
  Check Transport Requests: If the issue arose after a transport, check the transport requests to ensure that they do not contain conflicting objects. You may need to adjust the transport requests accordingly.
  Review Naming Conventions: Implement and enforce naming conventions within your development team to prevent future occurrences of this issue.
  Clear Cache: Sometimes, clearing the cache can help resolve issues related to loading objects. You can do this by using transaction code /n/SM12 to delete old locks or using transaction code /n/SAP_GUI to clear the GUI cache.
  
  Related Information:
  
  Transaction Codes: SE80 (Object Navigator), SE11 (Data Dictionary), SE37 (Function Module), SE38 (ABAP Program), SE24 (Class Builder).
  SAP Notes: Check SAP Notes related to this error message for any specific patches or updates that may address the issue.
  Documentation: Review SAP documentation on naming conventions and object management to ensure compliance with best practices.
  
  By following these steps, you should be able to resolve the R9E978 error and prevent it from occurring in the future.