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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message D0766 - The name & is already reserved for a type group ?

  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 control over the naming, choose a unique name that does not conflict with existing objects.
  
  
  
  Delete or Modify Existing Type Group: 
  
  If the existing type group is not needed, you may consider deleting it (if you have the necessary authorizations).
  Alternatively, you can modify the existing type group if it is appropriate to do so.
  
  
  
  Namespace Consideration: 
  
  If you are working in a development environment, ensure that you are using a proper namespace for your custom objects to avoid conflicts with standard SAP objects.
  
  
  
  Related Information:
  
  Type Groups: In ABAP, type groups are defined using the TYPE-POOL statement. They allow you to group related types together for better organization and reusability.
  Naming Conventions: Follow SAP's naming conventions for custom objects to minimize the risk of conflicts. Custom objects typically start with a prefix that identifies them as custom (e.g., Z or Y).
  Transport Requests: If you are working in a transport environment, ensure that your changes are properly included in transport requests to avoid issues when moving between systems.
  
  By following these steps, you should be able to resolve the D0766 error and successfully create or manage your type groups in SAP.