How To Fix D0766 - The name & is already reserved for a type group

D0766 - Overview

• Message type: E = Error

• Message class: D0 - Machine-level ABAP/4 Dictionary texts (e.g. debugging)

• Message number: 766

• Message text: The name & is already reserved for a type group

What causes this issue?

You want to create an object in a namespace that has already been
assigned a type group.
Within a type group you can define any number of types whose names are
made up of the names of the type group, an underscore line, and the type
name.
A type defined in a type group might be the same as the name of the
object that you created. In such cases, the definition from ABAP
Dictionary is overwritten in programs using this type group.
In certain circumstances, syntax errors can occur in consumer programs,
depending on whether the type group was loaded or not.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

You should use a different name.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

D0766 - Details

• The SAP error message D0766, which states "The name & is already reserved for a type group," typically occurs when you are trying to create a new type group in ABAP (Advanced Business Application Programming) with a name that is already in use. Type groups in ABAP are used to define a set of types that can be used across different programs.
  
  Cause:
  
  Name Conflict: The name you are trying to use for the type group is already reserved or defined in the system. This could be due to:
  An existing type group with the same name.
  A naming conflict with other objects in the SAP system (like function groups, classes, etc.).
  
  
  
  
  Solution:
  
  
  Check Existing Type Groups: 
  
  Use transaction SE11 (Data Dictionary) or SE80 (Object Navigator) to check if a type group with the same name already exists.
  If it does, consider using a different name for your new type group.
  
  
  
  Rename Your Type Group: 
  
  If you have